IB Biology HL D3.2.5 Dominant and Recessive Alleles Topic Practice

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Study D3.2.5—Dominant and recessive alleles conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

Question 1

[Maximum number: 1]

Huntington's disease is an autosomal dominant genetic disease. What are the chances of two parents that are heterozygous for the gene having a child with Huntington's disease?

A

25 %

B

50 %

C

75 %

D

100 %

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