Explain wild-type fruitfly drosophila melanogaster, Biology

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A cross among wild-type fruitfly Drosophila melanogaster  [normal bristles and grey body (s+s, e+ e)] with a mutant fly [short bristles and ebony body (ss ee)] produces following progeny:

a) Normal bristles with grey body - 537 flies

b) Short bristles with ebony body - 542 flies

c)  Normal bristles with ebony body - 76 flies

d) Short bristles with grey body - 75 flies

The map distance among 's' and 'e' genes will be:

 


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