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(B) The classification of chromosomes is based on the position of the centromere:$1$. Metacentric: The centromere is in the middle,resulting in two eq

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$1-d, 2-a, 3-b, 4-c$

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(B) The classification of chromosomes is based on the position of the centromere:$1$. Metacentric: The centromere is in the middle,resulting in two equal arms $(1-d)$.$2$. Submetacentric: The centromere is slightly away from the middle,resulting in one shorter arm and one longer arm $(2-a)$.$3$. Acrocentric: The centromere is situated close to the end,forming one extremely long arm and one very short arm $(3-b)$.$4$. Telocentric: The centromere is at the terminal end of the chromosome $(4-c)$.Therefore,the correct matching is $1-d, 2-a, 3-b, 4-c$.

Column-$I$	Column-$II$
$(1)$ Chromosome arms are of equal length	$(a)$ Submetacentric
$(2)$ One arm of the chromosome is shorter	$(b)$ Acrocentric
$(3)$ One arm is extremely long and the other is very short	$(c)$ Telocentric
$(4)$ Terminal centromere	$(d)$ Metacentric

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