A study found that children with light-coloured eyes are likely to have parents with light-coloured eyes. On this basis, can we say anything about whether the light eye colour trait is dominant or recessive? Why or why not?

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Solution

Let us assume that children with light-coloured eyes can either have LL or Ll or ll genotype. If the children have LL genotype, then their parents will also be of LL genotype.

LL

×

LL

↓

LL

If the children with light-coloured eyes have ll genotype, then their parents will also have ll genotype.

ll

×

ll

↓

ll

Therefore, it cannot be concluded whether light eye colour is dominant or recessive.

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