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3.3 Inheritance

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Question 22
H

A recessive allele a a\,a causes a condition. Two parents without the condition have an affected daughter. Their son does not have the condition.

Which statement about the son is correct?

[1]
A

He could have genotype AAAAAA or AaAaAa.

B

He must have genotype AAAAAA only.

C

He must have genotype AaAaAa only.

D

He could have genotype AaAaAa or aaaaaa.

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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