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 $D$.

List $I$	List $II$
$A$. Two or more alternative forms of a gene	$I$. Backcross
$B$. Cross of $F_1$ progeny with homozygous recessive parents	$II$. Ploidy
$C$. Cross of $F_1$ progeny with any of the parents	$III$. Allele
$D$. Number of chromosome sets in plant	$IV$. Test cross

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