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Inheritance and genetic crosses

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Question 16

Figure 3 shows the inheritance of albinism (an autosomal recessive condition) in a family.

Figure 3: A pedigree chart showing the inheritance of albinism over two generations.

A represents the dominant allele for normal melanin production (normal pigmentation).

a represents the recessive allele for albinism.

A geneticist states that Parent 1 must have the genotype Aa.

Explain why the geneticist is correct.

[2]

Inheritance and genetic crosses Questions

  1. GCSE
  2. /Biology
  3. /Inheritance and genetic crosses