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  4. Statement I: XO condition in Turner’s syndrome determines female sex Statement II: Homozygous XX produce male in Drosophila.

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Q. Statement I : $XO$ condition in Turner’s syndrome determines female sex
Statement II : Homozygous $XX$ produce male in Drosophila.

Principles of Inheritance and Variation

Solution:

Heterozygous $XY$ condition produce male in Drosophila.
In humans, $XX$ chromosomal condition determines the female sex. $XO$ condition in Turner’s syndrome determines female sex but the females are sterile due to absence of one $X$ chromosome.