A: Turner's syndrome generally does not occur | vedclass

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(A) Turner's syndrome is characterized by the $XO$ genotype $(44 + XO)$,which results in a female phenotype with underdeveloped ovaries and other phys

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Assertion and Reason both are correct and Reason is the correct explanation of Assertion.

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(A) Turner's syndrome is characterized by the $XO$ genotype $(44 + XO)$,which results in a female phenotype with underdeveloped ovaries and other physical abnormalities.It does not occur in males because the presence of at least one $X$ chromosome is essential for the survival of the human embryo.The $YO$ condition $(44 + YO)$ lacks an $X$ chromosome,which contains many vital genes necessary for development and survival.Therefore,a foetus with a $44 + YO$ chromosomal complement is non-viable and generally dies during early embryonic development.Thus,both the Assertion and the Reason are correct,and the Reason correctly explains why Turner's syndrome is not observed in males.

$A$: Turner's syndrome generally does not occur in males.
$R$: Foetus with $44 + YO$ complement generally dies.

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$A$: Turner's syndrome generally does not occur in males.$R$: Foetus with $44 + YO$ complement generally dies.