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Question

In fruit fly genes for red, eosin and white eye colour are allelic and sex linked. Gene for yellow body is linked with white eye with a cross over value of 1.5%. The probable crossover value between eosin and yellow body allele would be then

A
1.5%
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B
3%
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C
0.75%
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D
data insufficient
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Solution

The correct option is A 1.5%

Given red, eosin and white eye color are allelic and sex-linked. Also, the gene for the yellow body is linked with a white eye with a crossover value of 1.5%. When genes are linked, instead of asserting independently, the genes tend to stick together during crossing over in meiosis and thus move to the same gamete. Since yellow body-white eye crossover value is 1.5% and white eye and eosin are sex-linked, probable crossover value between yellow body and eosin should be the same, that is 1.5%.
So the correct answer is '1.5%'.

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