Unit 3 Chapter 1 (1st Secondary) Biology

47 Questions | By Semsem612 | Last updated: Mar 20, 2022 | Total Attempts: 368

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Unit 3 Chapter 1 (1st Secondary) Biology - Quiz

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1.

Chromosomes are arranged descendingly in a karyotype according to
- A.
  
  The number of genes that they carry
- B.
  
  The type of genes that they carry
- C.
  
  Their size
- D.
  
  Their density
2.

Karyotype of a male human differs from that of the female in the
- A.
  
  Number of sex chromosomes
- B.
  
  Type of sex chromosomes
- C.
  
  Arrangement of autosomes
- D.
  
  Number of the autosome pairs
3.

The figure represents the karyotype of a(an) -----------
- A.
  
  Human male
- B.
  
  Human female
- C.
  
  Sperm
- D.
  
  Ovum
4.

If the number of chromosomes in a human skin cells is 23 pairs, so the number of chromosomes in the sperm is
- A.
  
  23 pairs
- B.
  
  23
- C.
  
  46 pairs
- D.
  
  46
5.

The greatest number of chromosomes is found in the -------- cells
- A.
  
  Human
- B.
  
  Dog
- C.
  
  Cat
- D.
  
  Frog
6.

The least number of chromosomes is found in the ------ cells
- A.
  
  Wheat
- B.
  
  Onion
- C.
  
  Sweet potato
- D.
  
  Pea
7.

From the characters of the human sex chromosomes
- A.
  
  They are the pair number 7
- B.
  
  They are the pair number 23
- C.
  
  They do not carry genes
- D.
  
  They are autosomes
8.

The gene is formed of a sequence of
- A.
  
  DNA
- B.
  
  Nucleotides
- C.
  
  Amino acids
- D.
  
  Chromosomes
9.

The two scientists that had reached to the principles of the chromosomal theory are
- A.
  
  Urey and Miller
- B.
  
  Watson and Crick
- C.
  
  Mendel and Morgan
- D.
  
  Sutton and Boveri
10.

The ratio of segregation in the 2nd generation in the complete dominance according to Mendel's 1st law is
- A.
  
  3:0
- B.
  
  1:1
- C.
  
  3: 1
- D.
  
  1:2:1
11.

The ratio of the 2nd generation in the law of independent assortment is
- A.
  
  3:1
- B.
  
  1:1
- C.
  
  2:1
- D.
  
  9:3:3:1
12.

A crossing took place between a plant (BB) and another one (bb) , the result was the production of 150 new plants. so the number of plants which carries the genotype (Bb) was
- A.
  
  30
- B.
  
  150
- C.
  
  75
- D.
  
  50
13.

A male cat of a genotype (Aa) is crossed to a female one having the same genotype, so the possibility of producing cats with a genotupe (AA) is
- A.
  
  25%
- B.
  
  50%
- C.
  
  75%
- D.
  
  100%
14.

If the genotype of a child is (bb) so the genotype of his parents should be
- A.
  
  Bb x Bb
- B.
  
  BB x bb
- C.
  
  BB xBb
- D.
  
  BB x BB
15.

The percentage of gametes with a genotype (Ab) produced from Aabb is
- A.
  
  50%
- B.
  
  75%
- C.
  
  25%
- D.
  
  100%
16.

If the percentage of the offspring with a genotype AABB is 25% so the parents are
- A.
  
  AABB x aabb
- B.
  
  AABB x AaBb
- C.
  
  Aabb x aabb
- D.
  
  AaBB x AABB
17.

If two Pea plants carry purple flowers (Rr) were crossed, so the percentage of appearance of white flowers in the resulted generation is
- A.
  
  25%
- B.
  
  Zero %
- C.
  
  75%
- D.
  
  100%
18.

When a pure purple flowered Pea plant was crossed with another one of white flowers, so the resulted generation will be
- A.
  
  100% purple
- B.
  
  75% purple : 25% white
- C.
  
  50% purple : 50% white
- D.
  
  100% white
19.

The genotype GgRR can produce the following gametes
- A.
  
  Gg and Rr
- B.
  
  GG and Rr
- C.
  
  Gr and gR
- D.
  
  GR and gR
20.

A pure character is the character which has
- A.
  
  Two different genes
- B.
  
  Two genes on two different pairs of chromosomes
- C.
  
  Two similar genes
- D.
  
  Different alleles
21.

A gene is a section of _____ that contains the instructions for making a particular type of _______.
- A.
  
  DNA and protein
- B.
  
  Nucleus and cytoplasm
- C.
  
  DNA and chromosomes
- D.
  
  Chromosomes and protein
22.

Which one of the following is an acquired characteristic?
- A.
  
  Being a super taster
- B.
  
  Hair colour
- C.
  
  Eye colour
- D.
  
  Being good at football
23.

If you crossed two heterozygous plants, how many of the offspring will also be heterozygous?
- A.
  
  All
- B.
  
  Half
- C.
  
  3/4
- D.
  
  1/4
24.

A dihybrid cross (AaBb x AaBb) will result in what offspring ratio?
- A.
  
  9:3:3:1
- B.
  
  9:7
- C.
  
  3:1
- D.
  
  9:3:3:1 or 9:7
25.

A plant that has purple flowers is crossed with one that has white flowers. The offspring were half white and half purple. What were the genotypes of the parents?
- A.
  
  Pp X pp
- B.
  
  Pp X Pp
- C.
  
  PP X pp
- D.
  
  PP X Pp

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