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  • Which of the following is correct w.r.t sex determination in Drosophila? 1) It is determined by genic balance. 2) It is determined by the ration of X-chromosome to

Which of the following is correct w.r.t sex determination in Drosophila?

1) It is determined by genic balance.

2) It is determined by the ration of X-chromosome to autosomes

3) A fly with 2 autosomes and 2 X-chromosomes would be male

4) If X:A = 0.5, the fly would be male

 

Option: 1

1, 2 & 4


Option: 2

1, 2 & 3


Option: 3

2, 3 & 4

 


Option: 4

All of these


Answers (1)

best_answer

As we have studied in: 

Sex Determination in Drosophila -

  • Sex in Drosophila is determined by the 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)

Genic balance between autosomes and X-chromosomes determine sex in Drosophila. If the ration between X:A is 1, the fly would be female and if it is 0.5, the fly would be male. 

Hence, the correct answer is option a.

Posted by

jitender.kumar

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