A studyfound that children with light-coloured eyes are likely to haveparents with light-coloured eyes. On this basis, can we say anythingabout whether the light eye colour trait is dominant or recessive?Why or why not?

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Solution

Let usassume that children with light-coloured eyes can either have LL orLl or ll genotype. If the children have LL genotype, then theirparents will also be of LL genotype.

LL

Ã—

LL

â†“

LL

If thechildren with light-coloured eyes have ll genotype, then theirparents will also have ll genotype.

ll

Ã—

ll

â†“

ll

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

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