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5.1 Inheritance

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Question 22

Red-green colour blindness is an X-linked recessive condition determined by the recessive allele $X^d$ , while the dominant allele $X^D\,$ confers normal colour vision.

Which option correctly identifies the zygosity and genotype of a female carrier of red-green colour blindness?

A

Homozygous and $X^d X^d$

B

Heterozygous and $X^D X^d$

C

Homozygous and $X^D X^D$

D

Hemizygous and $X^d Y$

Markscheme

5.1 Inheritance Questions

GCSE
Biology
5.1 Inheritance

97 exam-style questions on OCR GCSE Biology 5.1 Inheritance, covering 5.1.1 The genome, 5.1.2 Environment and phenotype, 5.1.3 Variants and mutations, 5.1.4 How genetic variants influence phenotype, 5.1.5 Asexual and sexual reproduction, 5.1.6 Haploid and diploid, 5.1.7 Meiotic cell division, 5.1.8 Single gene inheritance, 5.1.9 Predicting single gene crosses, 5.1.10 Sex determination, 5.1.11 Multiple gene inheritance, and 5.1.12 Development of our understanding of genetics. Each one has a worked solution and a mark scheme showing where the marks go.

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