Question

is it a pair of chromosome or just a single chromosome​

Answer 1

Answer:Each chromosome pair consists of one chromosome inherited from the mother and one from the father. In addition to the 22 numbered autosomes, humans also have one pair of sex chromosomes called an allosome. Instead of labeling these chromosome pairs with numbers, allosomes are labeled with letters such as XX and XY.

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Answer 2

Answer:

A chromosome is an organized package of DNA found in the nucleus of the cell. Different organisms have different numbers of chromosomes. Humans have 23 pairs of chromosomes--22 pairs of numbered chromosomes, called autosomes, and one pair of sex chromosomes, X and Y. Each parent contributes one chromosome to each pair so that offspring get half of their chromosomes from their mother and half from their father.

Narration

A chromosome is the structure housing DNA in a cell. Chromosomes are structurally quite sophisticated, containing elements necessary for processes such as replication and segregation. Each species has a characteristic set of chromosomes with respect to number and organization. For example, humans have 23 pairs of chromosomes--22 pairs of numbered chromosomes called autosomes, 1 through 22, and one pair of sex chromosomes, X and Y. Each parent contributes one chromosome of each pair to an offspring.