Principle Of Inheritance And Variation Question 452
Question: In Drosophila, the sex is determined by [CBSE PMT 2003]
Options:
A) Whether the egg is fertilized or develops parthenogenetically
B) The ratio of number of X-chromosomes to the sets of autosomes
C) X and Y chromosomes
D) The ratio of pairs of X-chromosomes to the pairs of autosomes
Show Answer
Answer:
Correct Answer: B
Solution:
The ratio of X and A chromosomes responsible for determination of sex in drosophila e.g.
Superfemale - Number of X chromosome XXX/Set of autosome AA.
Sex index ratio (X/A) $ =\frac{3}{2}=1.5 $ Super female.
BETA
