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-$II$
$A$. Mendel	$i$. Allele
$B$. Bateson	$ii$. Factors
$C$. Johannsen	$iii$. Chromosome
$D$. Sutton and Boveri	$iv$. Gene

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Match the following columns:

Column-$I$ Column-$II$

$A$. Mendel $i$. Allele

$B$. Bateson $ii$. Factors

$C$. Johannsen $iii$. Chromosome

$D$. Sutton and Boveri $iv$. Gene

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