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3.3 Inheritance

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Question 15
H

In humans, sex is determined by the sex chromosomes.

a.

Use a genetic diagram to explain why the expected ratio of male to female offspring is 1:11:11:1.

[4]
b.

A couple plan to have three children.

Calculate the probability that all three children will be girls.

[2]
c.

In birds, males have two Z Z\,Z sex chromosomes (ZZZZZZ). Females have one Z Z\,Z and one W W\,W sex chromosome (ZWZWZW).

Explain which parent determines the sex of the offspring in birds.

[2]
Markscheme

3.3 Inheritance Questions

  1. GCSE
  2. /Biology
  3. /3.3 Inheritance

43 exam-style questions on Edexcel GCSE Biology 3.3 Inheritance, covering 3.3.1 Gregor Mendel and the basis of genetics, 3.3.2 Alleles and inherited characteristics, 3.3.3 Monohybrid inheritance, 3.3.4 Determination of sex at fertilisation, 3.3.5 Outcomes from monohybrid crosses, 3.3.6 Inheritance of ABO blood groups, 3.3.7 Inheritance of sex-linked disorders, and 3.3.8 Multiple genes and phenotypic features. Each one has a worked solution and a mark scheme showing where the marks go.

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