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3.3 Inheritance

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Question 29
H

Red-green colour blindness is caused by the recessive allele XcX^cXc. A woman with normal colour vision has a colour-blind father. She has children with a man with normal colour vision.

What percentage of their sons is expected to be colour blind?

[1]
A

50%50\%50%

B

0%0\%0%

C

25%25\%25%

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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