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Chromosomes

How many pair...

Question

How many pairs of chromosomes does a male Drosophila fly have? Which one of these bears the gene for the eye colour?

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Solution

In male Drosophila one X chromosome, one small Y chromosome, and two autosomes are present. The gene for the eye colour is located on the X chromosome.

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Q. Drosophila can have the following alleles for eye colour: red, white, apricot, eosine, wine,coral, cherry etc. Show by diagram, how many of these alleles will be present in one fly?

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map unit apart on chromosome. A female Drosophila with genotype

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and male Drosophila with genotype

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Q. How many X chromosomes does a male have?

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