Sex Determination – Check Test

1. Which line in the table correctly shows the genetic

symbols for male and female?

2. What are the human sex chromosomes?

A All Xs

B All Ys

C X and Y

D Y and Z

3. What are the sex chromosomes present in

body cells of a male?

A XX

B YY

C XY

D YZ

4. All sperm cells contain

A only X chromosomes.

B only Y chromosomes.

C both X and Y chromosomes.

D either X or Y chromosomes.

5. What are the sex chromosomes present in

body cells of a female?

A XX

B YY

C XY

D YZ

6. All egg cells contain

A only Y chromosomes.

B only X chromosomes.

C both X and Y chromosomes.

D either X or Y chromosomes.

7. What is the theoretical ratio of males to females

in the human population?

A 1:1

B 1:2

C 2:1

D 2:2

8. In a human family, there were three daughters and two sons.

Why is the ratio of males to females in this family different

from the theoretical ratio?

A There are always more females.

B It is much easier to produce a girl.

C More females die at birth.

D The process of fertilisation is random.