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5.1 Inheritance

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Question 34

Albinism is a genetic condition caused by a recessive allele ( $a$ ).

The Punnett square below shows the genetic cross of two heterozygous individuals ( $Aa \times Aa$ ):

\begin{array}{c|cc} & A & a \\ \hline A & AA & Aa \\ a & Aa & aa \end{array}

Which percentage of the offspring are expected to have albinism?

$25%25\%$

$50%50\%$

$75%75\%$

$100%100\%$

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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