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6.1 Reproduction

6.1 Reproduction

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Question 20

In red foxes (Vulpes vulpes), the sex of the offspring is determined by the inheritance of sex chromosomes X X\,X and Y Y\,Y in the same way as in humans.

  1. Complete the Punnett square representation below by identifying the chromosome combinations for the gametes and the offspring.
Female Gamete 1Female Gamete 2Male Gamete 1Offspring POffspring QMale Gamete 2Offspring ROffspring S \begin{array}{c|cc} & \text{Female Gamete 1} & \text{Female Gamete 2} \\ \hline \text{Male Gamete 1} & \text{Offspring P} & \text{Offspring Q} \\ \text{Male Gamete 2} & \text{Offspring R} & \text{Offspring S} \end{array} Male Gamete 1Male Gamete 2​Female Gamete 1Offspring POffspring R​Female Gamete 2Offspring QOffspring S​​

Identify:

a.

The genotypes of the female gametes and male gametes.

[2]
b.

The genotypes of offspring P, Q, R, and S.

[2]
c.

A female fox has a litter of 6 cubs. Explain why there might be 5 male and 1 female cubs, rather than exactly 3 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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