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3.3 Inheritance

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Question 32

A recessive sex-linked condition is caused by $X^h$ . A daughter has the condition, but her mother does not.

Which parental genotypes explain this?

[1]

mother $X^HX^H$ ; father $X^hY$

mother $X^HX^h$ ; father $X^HY$

mother $X^HX^H$ ; father $X^HY$

mother $X^HX^h$ ; father $X^hY$

Markscheme

3.3 Inheritance Questions

GCSE
Biology
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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