Question

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

Answer 1

Answer:

Eye colour is a polygenic trait, i.e., it is affected by multiple genes. The more the number of dominant genes you get, the darker is the colour of your eyes. So, if both the parents have light coloured eyes, it implies that they both have either only one or two or infact, no dominant genes.

Answer 2

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?

Since both the parents and the children all have light-coloured eyes.

There can be two possibilities:

1. Light coloured eyes is a recessive character. Both the parents with the light coloured eyes are homozygous recessive.
2. Light eye colour is dominant & parents are homozygous dominant.