A : In block inheritance of all genes located | vedclass

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(C) Assertion $(A)$ is correct. In some organisms,complete linkage occurs where all genes on the same chromosome are inherited together as a single bl

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Assertion is correct,but Reason is incorrect.

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(C) Assertion $(A)$ is correct. In some organisms,complete linkage occurs where all genes on the same chromosome are inherited together as a single block,resulting in no recombination.Reason $(R)$ is incorrect. $A$ dihybrid test cross $(AaBb 	imes aabb)$ typically results in four phenotypes in a $1:1:1:1$ ratio if the genes are assorting independently. If the genes are linked,the ratio changes,but it does not necessarily result in only two phenotypes unless the linkage is complete.

$A$ : In block inheritance of all genes located on the same chromosome may occur in some organisms.
$R$ : Dihybrid test cross will have only two phenotypes.

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$A$ : In block inheritance of all genes located on the same chromosome may occur in some organisms.$R$ : Dihybrid test cross will have only two phenotypes.