Identify the correct statement.

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(D) In grasshoppers,the sex determination mechanism is of the $XO$ type. Females have two $X$ chromosomes $(XX)$ and are homogametic,while males have

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All of the given statements are correct.

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(D) In grasshoppers,the sex determination mechanism is of the $XO$ type. Females have two $X$ chromosomes $(XX)$ and are homogametic,while males have only one $X$ chromosome $(XO)$ and are heterogametic. This makes option $A$ correct.In Drosophila,sex is determined by the ratio of $X$ chromosomes to autosomes,not by the fourth pair of chromosomes (which are dot-like autosomes). This makes option $B$ incorrect.In squash bugs (Anasa tristis),the sex determination mechanism is also of the $XO$ type,where males are $(XO)$ and females are $(XX)$. This makes option $C$ correct.Since both $A$ and $C$ are correct,the most appropriate answer is $D$.

Column-$I$	Column-$II$
$(P)$ $(2n-1)$	$(i)$ Produces normal female
$(Q)$ $Hb^s Hb^s$	$(ii)$ Produces haploid male
$(R)$ $22AA+XX$	$(iii)$ Causes Turner syndrome
$(S)$ $(X+O)$	$(iv)$ Causes sickle cell anemia
	$(v)$ Causes hemophilia
	$(vi)$ Shows Klinefelter syndrome

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