In Drosophila text{ } melanogaster, 3 pairs o | vedclass

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(D) In $Drosophila 	ext{ } melanogaster$, sex determination is based on the ratio of $X$ chromosomes to autosomes, where $XO$ results in a phenotypic

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Turner's syndrome

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(D) In $Drosophila 	ext{ } melanogaster$, sex determination is based on the ratio of $X$ chromosomes to autosomes, where $XO$ results in a phenotypically normal male.In humans, sex is determined by the presence of the $Y$ chromosome. The $XY$ genotype results in a male, while the $XX$ genotype results in a female.A human individual with $44$ autosomes and a single $X$ chromosome $(45, XO)$ lacks the $Y$ chromosome required for male development and has only one $X$ chromosome instead of two. This condition is known as Turner's syndrome, which results in sterile females with underdeveloped secondary sexual characteristics.

In $Drosophila \text{ } melanogaster$, $3$ pairs of autosomes and sex chromosomes of $XO$ type give rise to a normal male in appearance. In humans, $22$ pairs of autosomes and $XO$ type of sex chromosomes result in:

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