1.1. Image 7.1 shows a set of chromosomes from a human male body cell.

Image 7.1

(i) State the number of chromosomes in a human body cell.

[1]

(ii) Draw a circle around the sex chromosomes in Image 7.1.

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1.2. Images 7.2A and 7.2B show male and female lions.

(i) Complete the Punnett square below to show possible offspring when the male lion (XY) and the female lion (XX) mate.

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(ii) State the expected ratio of male:female lions in the offspring.

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(iii) State whether it is the male or female lion that determines the sex of the offspring. Explain your answer.

[2]

1.3. Lions have 38 chromosomes in their body cells.

(i) State how many chromosomes there are in a sex cell of a lion.

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(ii) State the scientific name for sex cells.

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(iii) Name the type of cell division that produces sex cells.

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