In human males,all the chromosomes are paired | vedclass

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(B) In human males,the sex chromosomes are $XY$. Unlike the autosomes,which exist in perfectly matched pairs,the $X$ and $Y$ chromosomes are morpholog

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$(iii)$ and $(iv)$

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(B) In human males,the sex chromosomes are $XY$. Unlike the autosomes,which exist in perfectly matched pairs,the $X$ and $Y$ chromosomes are morphologically different. The $X$ chromosome is a large chromosome,while the $Y$ chromosome is a small chromosome. Because they differ in size and genetic content,they do not form a perfectly matched pair. Therefore,both the $X$ and $Y$ chromosomes are considered unpaired in terms of homologous pairing. Thus,the correct answer is $(iii)$ and $(iv)$.

In human males,all the chromosomes are paired perfectly except one. These unpaired chromosomes are:
$(i)$ Large chromosome
$(ii)$ Small chromosome
$(iii)$ $Y-$ chromosome
$(iv)$ $X-$ chromosome

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In human males,all the chromosomes are paired perfectly except one. These unpaired chromosomes are:$(i)$ Large chromosome$(ii)$ Small chromosome$(iii)$ $Y-$ chromosome$(iv)$ $X-$ chromosome