A : Test cross is the tool for knowing linkag | vedclass

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(C) The Assertion is correct because a test cross (crossing an individual with a homozygous recessive parent) is used to determine the linkage between

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Assertion is correct,but Reason is incorrect.

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(C) The Assertion is correct because a test cross (crossing an individual with a homozygous recessive parent) is used to determine the linkage between genes. If genes are linked,the test cross ratio deviates from the expected Mendelian ratio.The Reason is incorrect because a monohybrid test cross (e.g.,$Tt 	imes tt$) results in a $1:1$ phenotypic ratio and a $1:1$ genotypic ratio. While it gives two phenotypes,it does not necessarily provide information about linkage between genes in the context of the assertion's claim. More importantly,the reason provided does not explain why a test cross is a tool for linkage.Therefore,the correct option is $C$.

List-$I$ (Type of Inheritance)	List-$II$ (Example)
$A$. Incomplete dominance	$I$. Blood groups in human
$B$. Co-dominance	$II$. Flower colour in Antirrhinum
$C$. Pleiotropy	$III$. Skin colour in human
$D$. Polygenic inheritance	$IV$. Phenylketonuria

Column-$I$	Column-$II$
$(A)$ Dominance	$(1)$ Many genes govern a single character.
$(B)$ Co-dominance	$(2)$ In a heterozygous organism, only one allele expresses itself.
$(C)$ Pleiotropy	$(3)$ In a heterozygous organism, both alleles express themselves fully.
$(D)$ Polygenic inheritance	$(4)$ $A$ single gene influences many characters.

$A$ : Test cross is the tool for knowing linkage between genes.
$R$ : Monohybrid test cross gives two phenotypes and two genotypes.

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$A$ : Test cross is the tool for knowing linkage between genes.$R$ : Monohybrid test cross gives two phenotypes and two genotypes.