A) the ratio of pairs of X-chromosomes to the pairs of autosomes
B) whether the egg is fertilized or develops parthenogenetically
C) the ratio of number of X-chromosomes to the set of autosomes
D) X and Y-chromosomes
Correct Answer: C
Solution :
Calvin Bridges demonstrated that in Drosophila, the sex is determined by ratio of the number of X-chromosomes to the sets of autosomes. According to balance theory of sex determination, Y-chromosome of Drosophila is not important for the determination of sex.
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