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3.3 Inheritance

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Question 5

Human ABO blood groups are controlled by three alleles: $I^A$ , $I^B\,$ and $i$ .

Which statement describes an individual with blood group AB?

[1]

Only the $I^A$ allele is expressed.

Both $I^A$ and $I^B$ are expressed.

Only the $I^B$ allele is expressed.

Neither $I^A$ nor $I^B$ is expressed.

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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