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3.3 Inheritance

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Question 31
H

A woman with genotype XHXh X^HX^h\,XHXh and a man with genotype XhY X^hY\,XhY have children. The recessive allele Xh X^h\,Xh causes a condition.

What percentage of all their children is expected to have the condition?

[1]
A

25%25\%25%

B

50%50\%50%

C

75%75\%75%

D

100%100\%100%

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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