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6.1 Reproduction

6.1 Reproduction

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Question 17

In cats, the sex of the offspring is determined by the inheritance of sex chromosomes XXX and YYY in the same way as in humans.

  1. Complete the Punnett square representation below by identifying the allele combinations for the gametes and the offspring.
Female Gamete 1Female Gamete 2Male Gamete 1Offspring AOffspring BMale Gamete 2Offspring COffspring D \begin{array}{c|cc} & \text{Female Gamete 1} & \text{Female Gamete 2} \\ \hline \text{Male Gamete 1} & \text{Offspring A} & \text{Offspring B} \\ \text{Male Gamete 2} & \text{Offspring C} & \text{Offspring D} \end{array} Male Gamete 1Male Gamete 2​Female Gamete 1Offspring AOffspring C​Female Gamete 2Offspring BOffspring D​​

Identify:

a.

The genotypes of the female gametes and male gametes.

[2]
b.

The genotypes of offspring A, B, C, and D.

[2]
c.

A female cat has a litter of 888 kittens. Explain why there might be 555 female and 333 male kittens, rather than exactly 444 of each.

[3]
Markscheme

6.1 Reproduction Questions

  1. GCSE
  2. /Biology
  3. /6.1 Reproduction

76 exam-style questions on AQA GCSE Biology 6.1 Reproduction, covering 6.1.1 Sexual and asexual reproduction, 6.1.2 Meiosis, 6.1.3 Advantages and disadvantages of sexual and asexual reproduction, 6.1.4 DNA and the genome, 6.1.5 DNA structure, 6.1.6 Genetic inheritance, 6.1.7 Inherited disorders, and 6.1.8 Sex determination. Each one has a worked solution and a mark scheme showing where the marks go.

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