Genes and Inheritance

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Inheritance

(Credits to Mustafa Asif)

Notes

Terminologies

Variation

Cell Division

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MCQ

1. There are 20 chromosomes in each leaf cell of a maize plant. What is the number of chromosomes in the male nucleus of a pollen grain of maize?

a. 5

b. 10

c. 20

d. 40

2. The list gives some of the stages involved in gamete and zygote formation.

1 Prophase I

2 Prophase II

3 Metaphase I

4 Fertilisation

During which stages do events occur that increase genetic variation in the zygote?

a. 1, 2, and 3

b. 1, 3, and 4

c. 2 and 3

d. 3 and 4

3. In which structure are the cells dividing by mitosis only?

a. ovary

b. root tip

c. stamen

d. testis

4.

The process represents the basic changes during

a. mitosis

b. meiosis

c. development

d. fertilisation

5. The process takes place

a. only in animals that reproduce sexually

b. only in animals and plants that reproduce asexually

c. in all animals and plants that reproduce sexually

d. in all animals and in all plants

6. What is the diploid number of chromosomes in the above diagram?

a. 2

b. 4

c. 8

d. 16

7. Between which stages would "crossing over" most likely to take place?

a. A --> B

b. C --> D

c. D --> E

d. F --> G

8.

MCQ Answers

1. b

2. b

3. b

4. b

5. c

6. b

7. a

8. b