Unit 3 Chapter 3 (1st Secondary) Biology
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The formation of the two testes in the fetus begins after about ............ weeks from fertilization
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8
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4
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6
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10
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Unit 3 Chapter 3 (1st Secondary) Biology
Quiz Preview
- 2.
Red-green color blindness is X-linked in humans. If a male is red-green color blind, and each of his parents have normal color vision, which of the male's grandparents is most likely to be red-green color blind?
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Maternal grandfather
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Maternal grandmother
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Paternal grandfather
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Paternal grandmother
Correct Answer
A. Maternal grandfather -
- 3.
A couple has a female child with Tay Sachs disease, and three unaffected children. Neither parent nor any of the four biological grandparents of the affected child has had this disease. Tay Sachs disease is a genetic lethal disease that leads to death usually in early childhood. The most likely genetic explanation is that Tay Sachs disease is inherited as a/an ______________ disease.
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Sex-linked recessive
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Sex-linked dominant
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Autosomal recessive
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Autosomal dominant
Correct Answer
A. Autosomal recessive -
- 4.
Which of the following is not among the aims of the human genome project?
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Gene therapy for normalizing blood glucose levels
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Genetic testing for hemophilia
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Genetic testing for typhoid disease
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Evolutionary relationship
Correct Answer
A. Genetic testing for typhoid disease -
- 5.
Alternation of the nucleotide sequence of a gene causes a change ------
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In the karyotype of somatic cells
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In the DNA finger print
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In the structure of the chromosome
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In the function of the protein formed by that gene
Correct Answer
A. In the function of the protein formed by that gene -
- 6.
All of the following give information about their genotype except …….
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Colour blind male
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Hemophiliac male.
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Tall Pea plant
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Female carrier for colour-blindness.
Correct Answer
A. Tall Pea plant -
- 7.
A woman with one gene for haemophilia and one gene for colour blindness marries a normal man. How will the progeny be?
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Haemophilic and colour blind daughters
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All sons and daughters are haemophilic and colour blind
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50% haemophilic, colour blind sons and 50% normal sons
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50% haemophilic, colour blind sons and 50% normal daughters
Correct Answer
A. 50% haemophilic, colour blind sons and 50% normal sons -
- 8.
A chromosomal abnormality that causes a woman to be unusually short in stature, to have a webbed neck, and to generally lack feminine secondary sexual characteristics is:
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Triple-X syndrome
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A woman with only one sex chromosome
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A woman with Down's syndrome
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XYY syndrome
Correct Answer
A. A woman with only one sex chromosome -
- 9.
Which of the following statements is true?
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All your cells have the same genome, but different parts are active in different cells.
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Your cells have different genome, and different parts are active in different cells.
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All your cells have the same genome and all parts of the genome are active in all cells.
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Your cells have different genome and all parts of the genome are active in all cells.
Correct Answer
A. All your cells have the same genome, but different parts are active in different cells. -
- 10.
What is the sex complement of a male child who has Down’s syndrome?
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XY
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XO
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XX
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XXX
Correct Answer
A. XY -
- 11.
What will be the consequences of mating between a pure normal female and a hemophiliac male?
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50% daughter will be normal and 50% son will be hemophiliac.
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All daughters will be carriers and all sons will be normal.
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All daughters will be normal and all sons will be carrier.
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50% daughter will be hemophiliac and 50% son will be normal.
Correct Answer
A. All daughters will be carriers and all sons will be normal. -
- 12.
Which one of the following statements does not match accurately the other statements in describing a specific chromosomal disorder?
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Upward slanting eyes.
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Small head and ears
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Taller than average height
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An extra copy of chromosome 21
Correct Answer
A. Taller than average height -
- 13.
The following pedigree is for the inheritance of muscles atrophy disease in human beings.If the gene X is for normal muscles and the gene X' is for the atrophy of muscles, so what is the genotype of each of the members number 1 and number 2 in the second generation? N.B. Square is a male and a circle is a female.
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1 is X'Y and 2 is XX'
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1 is X'Y and 2 is X'X'
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1 is XY and 2 is XX'
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1 is XY and 2 is X'X'
Correct Answer
A. 1 is XY and 2 is X'X' -
- 14.
The following figure illustrates the karyotype of an individual. What is the chromosomal structure of the gametes produced by this individual?
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(22 + X) and (22 + X)
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(22 + XX) and (22 + 0)
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(22 + X) and (23 + X)
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(22 + X) and (22 + XX)
Correct Answer
A. (22 + X) and (23 + X) -
- 15.
A turner female has a chromosomal structure of .........
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XY
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XO
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XXX
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XX
Correct Answer
A. XO -
- 16.
The number of autosomes in the human ovum is ........
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46
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22
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23
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44
Correct Answer
A. 22 -
- 17.
The person having (45 + XY) is a ........
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Female with Down's syndrome
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Female with Turner's syndrome
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Male with a Down's syndrome
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Male with Klinefelter's syndrome
Correct Answer
A. Male with a Down's syndrome -
- 18.
.......... is an example of sex linked traits.
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Colour of feathers in Andalusian Fowls
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Fur colour in mice
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Blood groups in Man
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Eyes colour in Drosophila
Correct Answer
A. Eyes colour in Drosophila -
- 19.
The ability of a female bird to lay eggs is a ...........
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Sex-limited trait
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Sex-linked trait
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Sex-influenced trait
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Mendelian trait
Correct Answer
A. Sex-limited trait -
- 20.
Chromosome X differs from that of Y in .......
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Shape
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Size
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Number of genes it carries
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All the previous
Correct Answer
A. All the previous -
- 21.
The figure represents a karyotype of .........
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Klinefelter's syndrome
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Turner's syndrome
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Down's syndrome
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Normal male
Correct Answer
A. Klinefelter's syndrome -
- 22.
Klinefelter's syndrome results due to the fertilization of an abnormal ovum having two X chromosomes by a sperm of ..........
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22 + X
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22 + Y
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44 + O
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44 + Y
Correct Answer
A. 22 + Y -
- 23.
When a healthy man marries a haemophylic carrier woman, the possibility of producing females with haemophilia disease is ........... %
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50
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25
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Zero
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100
Correct Answer
A. Zero -
- 24.
From the examples of sex-influenced traits in human, we have .........
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Colour blindness
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Haemophilia
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Early (genetic) baldness
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Infantile paralysis
Correct Answer
A. Early (genetic) baldness -
- 25.
From the examples of sex-limited traits, we have
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Early baldness
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Appearance of beard
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Colour blindness
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Haemophilia
Correct Answer
A. Appearance of beard -
- 26.
A male with a Down's syndrome results from the fertilization of a normal ovum by a sperm of ........
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22 + XY
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22 + Y
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23 + Y
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23 + X
Correct Answer
A. 23 + Y -
- 27.
In Drosophila, XRXr is a ......
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White eyed male
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White eyed female
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Red eyed male
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Red eyed female
Correct Answer
A. Red eyed female -
- 28.
A female suffers from a genetic hair falling, has a chromosomal structure of .......... (if B+ is the gene for hair falling).
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B+ B
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B B
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B B+
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B+ B+
Correct Answer
A. B+ B+ -
- 29.
In a family, father is having a disease and mother is normal. The disease is inherited to only daughters and not to the sons. What type of disease is this?
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Sex linked dominant
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Sex linked recessive
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Autosomal dominant
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Autosomal recessive
Correct Answer
A. Sex linked dominant -
- 30.
A person with 44+XYY composition. The non-disjunction is in the ______ parent and in _______ meiotic division.
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Male, 1st
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Male, 2nd
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Female, 1st
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Female, 2nd
Correct Answer
A. Male, 2nd -
- 31.
In the genotype B+B+XRY appears between sons, the possible genotypes of parents are -----
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B+BXRXR x B+BXRY
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B+BXRXr x BBXRY
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B+BXrXr x BBXRrY
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B+B+XRXR x BBXRY
Correct Answer
A. B+BXRXR x B+BXRY -
- 32.
The chromosomes Z and W in Birds are alternatives respectively to X and Y in mammals, The sex of birds is determined by the FEMALE and not the male. in a certain strain of birds the gene (G) for green colour dominates the gene (g) for purple one. if you know that this trait is a sex-linked one, so what is the genotype of a male and female birds crossed together producing, 50% heterozygous green males and 50% purple females.
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ZGZG and ZgW
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ZGZg and ZgW
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ZgZg and ZGW
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ZGZg and ZGW
Correct Answer
A. ZgZg and ZGW -
- 33.
The number of sex chromosomes in the normal human sperm is .......
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46
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23
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1
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2
Correct Answer
A. 1 -
- 34.
The chromosomal structure of the ovum in human is .......
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44 + XX
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22 + XY
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22 + X
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All the previous
Correct Answer
A. 22 + X -
- 35.
From the examples of sex linked traits we have .........
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Colour blindness
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Appearance of beard
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Genetic baldness
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Eye colour in human beings
Correct Answer
A. Colour blindness -
- 36.
If a healthy man marries a colour-blinded woman, the disease will appear in .......... of their offspring.
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All of the males
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All of the females
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Half of the females
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Half of the males
Correct Answer
A. Half of the males -
- 37.
Which of the following pairs of parents is most likely to produce a daughter with hemophilia?
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A hemophiliac mother and an unaffected father
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A carrier mother and an unaffected father
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A carrier mother and a hemophiliac father
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An unaffected, non-carrier mother and a hemophiliac father
Correct Answer
A. A carrier mother and a hemophiliac father -
- 38.
The genes of early baldness in man are carried on ...........
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X chromosome
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Y chromosome
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X and Y chromosomes
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Autosomes
Correct Answer
A. Autosomes -
- 39.
A male with klinefelter syndrome and of blood group A is married to a normal female of blood group B. What is the probability to have a girl with blood group O?
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25%
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Zero %
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50%
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100%
Correct Answer
A. Zero % -
- 40.
........... are responsible for sexual dimorphism (differences in appearance between males and females of the same species.)
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Sex-linked genes
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Sex-influenced genes
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Sexual disorders
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Sex-limited genes
Correct Answer
A. Sex-limited genes -
- 41.
A girl has failed in the traffic light test. Which of the following are the possible phenotypes for her parents?
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Father is colour blind and mother is carrier for the disease
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Both father and mother are normal
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Mother is carrier for the disease and father is normal
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Father is colour blind and mother is normal
Correct Answer
A. Father is colour blind and mother is carrier for the disease -
- 42.
If a bald male has normal parents. What is the probability for the parents to have a bald girl?
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25%
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50%
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75%
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Zero %
Correct Answer
A. Zero % -
- 43.
Which of the following is not true about autosomes in human beings?
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They 44 chromosomes
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They carry genes for sex-linked characters
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They carry genes for sex influenced characters
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They are of different size
Correct Answer
A. They carry genes for sex-linked characters -
- 44.
The following table illustrates the gametes that are produced by a two parents. Which of the following offspring will have abnormal chromosomal inheritance?
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A and C
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D and C
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A and B
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B and D
Correct Answer
A. B and D -
- 45.
Which cell of the following does not contain homologous pairs of chromosomes?
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Companion cell in phloem tissue
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Parenchyma cell
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The egg of Ostrich
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A cell in the ovarian wall in Drosophila
Correct Answer
A. The egg of Ostrich -
- 46.
The following table illustrates the gametes that are produced by a two parents. What is the genetic case that the mother suffers from?
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Down’s syndrome
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Klinefilter syndrome
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Triple-X syndrome
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Turner syndrome
Correct Answer
A. Down’s syndrome -
- 47.
Turtles lay eggs in deep holes near the sea shore in different layers where those at the bottom resulting in all males while top eggs resulting in all females. Which of the following factors affects the kind of sex in Turtles?
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Salinity of water
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Presence of X chromosome
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Environmental conditions
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The Y chromosome
Correct Answer
A. Environmental conditions -
- 48.
The figure below illustrates fraternal twins of two different sexes. If at the end of the second month of pregnancy the gonads of the embryo (A) appears, then how many weeks are remained for the appearance of the gonads in embryo (B)?
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Three
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Four
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Five
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Six
Correct Answer
A. Six -
- 49.
A scientist is studying an animal and determines that a gene is located on autosome two. It controls antler (branched horns) production in the male animals. Note that females do not produce antlers. This is an example of a ........
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Recessive trait
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Dominant trait
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Sex-linked trait
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Sex-limited trait
Correct Answer
A. Sex-limited trait -
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