1.

In Drosophila, the sex is determined byA. the ratio of pairs of X-chromosomes to the pairs of autosomesB. whether the egg is fertilised or develops parthenogeneticallyC. the ratio of number of X-chromosomes to the set of autosomesD. X and Y-chromosomes

Answer» Correct Answer - A
Calvin Bridges demonstrated that in Drosophilia, the sex is detemined by ratio of the number of X-chromosomes to the sets of autosomes. According to genic balances theory of sex-determination, Y-chromosome of Drosophilia does not important for the determination of sex.


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