S - Statement: Based on the position of the c | vedclass

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(B) Statement $S$ is true because chromosomes are classified into four types (metacentric,sub-metacentric,acrocentric,and telocentric) based on the po

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$S$ and $R$ are both true,but $R$ is not the correct explanation of $S$.

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(B) Statement $S$ is true because chromosomes are classified into four types (metacentric,sub-metacentric,acrocentric,and telocentric) based on the position of the centromere.Reason $R$ is also true because the centromere is indeed the primary constriction on the chromosome,and it contains disc-shaped structures called kinetochores.However,the reason $R$ describes the structure of the centromere,while statement $S$ describes the classification based on its position. Therefore,$R$ is not the direct explanation for why there are four types of chromosomes.

$S -$ Statement: Based on the position of the centromere,chromosomes are classified into four types.
$R -$ Reason: Chromosomes contain a centromere,which is a primary constriction or disc-shaped structure.

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$S -$ Statement: Based on the position of the centromere,chromosomes are classified into four types.$R -$ Reason: Chromosomes contain a centromere,which is a primary constriction or disc-shaped structure.