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Question

Multiple allele system controls drosophila eye colour; which of the following sequence is true for the dominance relationship?

A
Eosin > red > white
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B

Red > eosin > white

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C

White > red > eosin

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D

Eosin > white > red

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Solution

The correct option is B

Red > eosin > white


In drosophila, eye color is controlled by 15 alleles, wild type or normal allele is 'W' which produces red eye color which is dominant over all other alleles. Allele 'w' codes for white eye color which is recessive to all other alleles. Alleles of other eye color traits are intermediate between the two. They show various types of codominance and incomplete dominance.

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