A study found that children with light-coloured eyes are likely to have parents with light-coloured

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8. Heredity

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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 ?

Option A

Option B

Option C

Option D

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.

$LL\,\,\times \,\,LL$

$\downarrow $

$ LL$

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

$ll\,\,\times \,\,ll$

$\downarrow $

$ll$

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

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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 ?

Solution

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