Biology 101 Chapters 15 Thru 19
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Chromosomal basis of inheritance, DNA from Gene to Protein, genetics of viruses and bacteria
- 1.The chromosome theory of inheritance states that _____.
- A.
Genes occupy specific positions on chromosomes
- B.
Homologous chromosomes segregate from each other during meiosis
- C.
Chromosomes assort independently during meiosis
- D.
All of the above
- 2.If two genes are linked, _____.
- A.
They are on different chromosomes
- B.
They assort independently
- C.
They code for the same protein
- D.
They are on the same chromosome
- E.
They are on sex chromosomes
- 3.What is the probability that a male will inherit an X-linked recessive allele from his father?
- A.
10%
- B.
25%
- C.
50%
- D.
100%
- E.
0%
- 4.In an X-linked, or sex-linked, trait, it is the contribution of _____ that determines whether a son will display the trait.
- A.
The father
- B.
The mother
- C.
The grandmother
- D.
The grandfather
- E.
The brother or sister
- 5.If a mother is heterozygous for a recessive sex-linked trait and her husband has the dominant allele, which one of the following is true about the probabilities for their children?
- A.
Half of their sons will have the recessive trait.
- B.
0% of their sons will have the recessive trait.
- C.
25% of their sons will have the recessive trait.
- D.
75% of their sons will have the recessive trait.
- E.
100% of their sons will have the recessive trait.
- 6.
A woman is a carrier for red-green color blindness, a sex-linked trait. Her husband is normal (not color-blind) for this trait. What are the chances that their newborn daughter will be red-green color-blind? - A.
0%
- B.
25%
- C.
50%
- D.
75%
- E.
100%
- 7.Cells that have more than two complete sets of chromosomes are termed _____.
- A.
Diploid
- B.
Haploid
- C.
Polyploid
- D.
Gametes
- E.
Chromosomal abnormalities
- 8.Which one of the following is the only known viable human monosomy?
- A.
XO
- B.
YO
- C.
XXY
- D.
XYY
- E.
XXX
- 9.It is proposed that a certain disorder affecting the inner ear is caused by mitochondrial DNA. Which of the following observations would be the most decisive evidence against this idea?
- A.
The precise cause of the disorder is found to involve the nervous system.
- B.
Mothers pass the disorder on to their offspring, but fathers do not.
- C.
Females and males have the disorder in equal numbers.
- D.
Females with the disorder pass it to all their children, but males only pass it to half their offspring.
- E.
Fathers with the disorder pass it on to all their children, but mothers with the disorder do not pass it along.
- 10.A color-blind woman mates with a male with normal color vision. Which of these results would indicate that color blindness is caused by an X-linked recessive allele?
- A.
Half of the sons and half of the daughters are color-blind.
- B.
All of the daughters, and none of the sons, are color-blind.
- C.
All of the sons, and none of the daughters, are color-blind.
- D.
The offspring occur in a ratio of 3 color-blind : 1 normal vision.
- E.
The offspring occur in a ratio of 9 normal vision males : 3 color-blind vision males : 3 normal vision females : 1 color-blind female.
- 11.Color blindness is an X-linked recessive trait. A color-blind man has a daughter with normal color vision. What is the genotype of the daughter?
- A.
XCXc
- B.
XCXC
- C.
XcXc
- D.
XCY
- E.
XcY
- 12.Color blindness is an X-linked recessive trait. Under what conditions can an unaffected male have a color-blind daughter?
- A.
He is heterozygous for color vision.
- B.
His mate is color-blind.
- C.
His father is color-blind.
- D.
His mother is color-blind.
- E.
He can't.
- 13.Humans are diploid and have 46 chromosomes (or two sets). How many sets of chromosomes are found in each human gamete?
- A.
1
- B.
2
- C.
3
- D.
4
- E.
5
- 14.Humans are diploid and have 46 chromosomes. How many chromosomes are found in each human gamete?
- A.
12
- B.
23
- C.
46
- D.
92
- E.
6
- 15._____ is the process by which haploid gametes form a diploid zygote.
- A.
Embryogenesis
- B.
Fertilization
- C.
Meitosis
- D.
Gastrulation
- E.
Mitosis
- 16.Which of these terms applies to an organism with extra sets of chromosomes?
- A.
Monosomy
- B.
Haploid
- C.
Diploid
- D.
Trisomy
- E.
Polyploid
- 17.Give an example of monosomy.
- 18.Give an example of trisomy.
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