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Inheritance and genetic crosses

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Question 34

Albinism is an inherited condition caused by a recessive allele. It results in a lack of pigment in the skin, hair, and eyes.

Below is a pedigree chart showing the inheritance of albinism in a family.

A pedigree chart showing the inheritance of albinism, an autosomal recessive condition. Circles represent females and squares represent males. Shaded shapes represent individuals affected by albinism, and unshaded shapes represent unaffected individuals. Generation I: Person A (unaffected male) and Person B (affected female) has children. Generation II: They have two children, Person C (unaffected male) and Person D (affected female). Person C is partners with Person E (unaffected female). Generation III: They have one child, Person F (affected male).

State the genotype of Person C.

Use the symbols:

  • N for the dominant allele (normal pigmentation)
  • n for the recessive allele (albinism)
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Inheritance and genetic crosses Questions

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