A study found that children with light-coloured eyes are likely to have parents with light colored eyes. On this basis can we say anything about whether the light eye color trait is dominant or recessive? Why or why not? [3 MARKS]

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Solution

Each point: 1.5 Mark

1. Let us assume that children with light-colored 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

2. If the children with light colored eyes have ll genotype then their parents will also have ll genotype.

ll × ll

↓

ll

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

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(a) E is the gene for brown eye colour and e is the gene for blue eye colour. Which gene is (i) recessive, and (ii) dominant?

(b) Both father and mother have the genes Ee in their cells. What colour are their eyes?

(d) Which combination of genes in the zygote will produce children with brown eyes?

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