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IGCSE Biology Extended17.1.4—Inheritance of sex in humansTopic Practice

17.1.4—Inheritance of sex in humans

• Describe the inheritance of sex in humans with reference to X and Y chromosomes

Question 2(b)

[Maximum number: 2]

The Indian muntjac deer, Muntiacus muntjak, is recorded as the mammal with the lowest number of chromosomes.

Fig. 2.1 is an image of the chromosomes in the nucleus of a diploid cell of a female muntjac deer.

Fig. 2.1

Fig. 2.1

Fig. 2.2 is an image of the chromosomes in the nucleus of a diploid cell of a male muntjac deer.

Fig. 2.2

Fig. 2.2

Describe how the sex chromosomes of the male muntjac deer shown in Fig. 2.2 differ from those of the female shown in Fig. 2.1.

Question 3(a)

[Maximum number: 3]

Sex in cats is determined in the same way as in humans.
Complete the diagram below to show how sex is determined in cats.

 male cat × female cat \text { male cat } \times \text { female cat }
Question image

offspring ratio

Question 28

[Maximum number: 1]

Which diagram shows the correct inheritance of sex chromosomes?

A

A

B

B

parent 1

parent 1

D parent 1

D parent 1

Question 30

[Maximum number: 1]

Owners of successful race horses hope that the horses' offspring will be like their parents.
How does a young race horse inherit its characteristics?

A

equally from its mother and father

B

mainly from its father

C

mainly from its mother

D

passed across the placenta

Question 32

[Maximum number: 1]

Which combination of chromosomes from egg and sperm cells will produce a boy?

egg

sperm

X

X

X

Y

Y

X

Y

Y

Question 33

[Maximum number: 1]

Which statement about the sex chromosomes is correct?

A

Men and women can inherit characteristics from genes carried on the X chromosome.

B

Men and women can inherit characteristics from genes carried on the Y chromosome.

C

Only men can inherit characteristics from genes carried on the X chromosome.

D

Only women can inherit characteristics from genes carried on the Y chromosome.

Question 6

Question 6(c)

(a)

Explain why the nuclei of sperm cells differ from those of other cells in the male.

[ 2 ]

Question 6(e)

(b)

Explain why the sex of a child is determined by its father.

[ 2 ]

Question 5(c)

[Maximum number: 1]

Fig. 5.1 shows people fishing on a large scale and a small scale.

Fig. 5.1

Fig. 5.1

All types of fishing can have a negative impact on fish stocks.

State how sex is inherited in humans.

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