February/March 2026 Paper 22

2026 · 40 questions · 40 parts · 40 marks

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30Inheritance Genetic CrossesMedium1 mark
The allele for short hair in cats is recessive and the allele for long hair in cats is dominant. The pedigree diagram shows the inheritance of hair length in a family of cats.
Pedigree diagram of cats over four generations, with a key: open circle female cat with long hair, shaded circle female cat with short hair, open square male cat with long hair, shaded square male cat with short hair
How many cats must be heterozygous for hair length?