Question 4:
A study found that children with light-coloured eyes are likely to have parents with
lightcoloured eyes. On this basis, can we say anything about whether the light eye
colour trait is dominant or recessive? Why or why not?
Answer:
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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