Question

what is metacentric,sub-metacentric,acrocentric and telocentric​

Answer 1

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Metacentric :

These are X-shaped chromosomes, with the centromere in the middle so that the two arms of the chromosomes are almost equal. A chromosome is metacentric if its two arms are roughly equal in length.

Sub Metacentric :

having the centromere situated so that one chromosome arm is somewhat shorter than the other.

Acrocentric :

A chromosome in which the centromere is very close to one end. For example, the centromere of chromosomes 13, 14, 15, 21, and 22 is very close to the p telomere, making the p arm very short.

Telocentric :

Telocentric chromosomes are rarely encountered in plants. They are known to occur in taxa like Stangeria, Podocarpus, Welwitschia etc., among gymno- sperms and Allium, Nothoscardum, Oxalis, Tradescantia and a few others in angiosperms.