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6.1 Reproduction

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Question 5
F

In humans the sex chromosomes of a female are XX and of a male are XY. Which statement explains why about half of all babies born are boys?

[1]
A

Half of the mother's egg cells carry a Y chromosome

B

Half of the father's sperm cells carry a Y chromosome

C

Half of the mother's egg cells carry two X chromosomes

D

Half of the father's sperm cells carry two X chromosomes

Markscheme

6.1 Reproduction Questions

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

39 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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