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5.1 Inheritance

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Question 31
H

In humans, approximately equal numbers of boys and girls are born.

Which statement explains why?

[1]
A

Meiosis in the father produces equal numbers of sperm carrying X\text{X}X and Y\text{Y}Y.

B

Meiosis in the mother produces equal numbers of eggs carrying X\text{X}X and Y\text{Y}Y.

C

Meiosis in both parents produces gametes with one X\text{X}X and one Y\text{Y}Y chromosome.

D

Meiosis in the father produces sperm that all carry both an X\text{X}X and a Y\text{Y}Y.

Markscheme

5.1 Inheritance Questions

  1. GCSE
  2. /Biology
  3. /5.1 Inheritance

186 exam-style questions on OCR GCSE Biology 5.1 Inheritance, covering 5.1.1 The genome, 5.1.2 Environment and phenotype, 5.1.3 Variants and mutations, 5.1.4 How genetic variants influence phenotype, 5.1.5 Asexual and sexual reproduction, 5.1.6 Haploid and diploid, 5.1.7 Meiotic cell division, 5.1.8 Single gene inheritance, 5.1.9 Predicting single gene crosses, 5.1.10 Sex determination, 5.1.11 Multiple gene inheritance, and 5.1.12 Development of our understanding of genetics. Each one has a worked solution and a mark scheme showing where the marks go.

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