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  • In Drosophila, the sex is determined byOption: 1 Whether the egg is fertilized or develops parthenogenetically<div class='qna-

In Drosophila, the sex is determined by

Option: 1

Whether the egg is fertilized or develops parthenogenetically


Option: 2

The ratio of number of X-chromosomes to the sets of autosomes


Option: 3

X and Y chromosomes


Option: 4

The ratio of pairs of X-chromosomes to the pairs of autosomes


Answers (1)

best_answer
 

As we have studied in:

Sex Determination in Drosophila -

  • Sex in Drosophila is determined by genic balance mechanism.
  • Drosophila has eight chromosomes, in which six are autosomes and are common to both males and females.
  • The fourth pair is of sex chromosomes. In males, these are represented by XY and in females as XX.
  • Genic balance theory, proposed by Calvin Bridges states that sex is determined by the genic balance or ration between X-chromosome and autosome (X:A).

The ratio of X and A chromosomes responsible for determination of sex in drosophila. Hence, the correct answer is option b.

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