Question

why chromosome always present in pairs ​

Answer 1

Answer:

Humans, along with other animals and plants, have linear chromosomes that are arranged in pairs within the nucleus of the cell. The only human cells that do not contain pairs of chromosomes are reproductive cells, or gametes, which carry just one copy of each chromosome.

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Answer 2

Chromosomes occurs in pair so that their won’t be any chance of defective daughter cells that arise due to uneven distribution of chromosome. Suppose if they are not present in pair then during anaphase spindle fibre will bring them apart form each other in an uneven fashion. This might lead to uneven distribution and may become fatal to the new daughter cells.