A human has .… pairs of chromosomes

Question

BlackTom AI · Accepted Answer

Reiterating the question and options to set the context: A human has .… pairs of chromosomes

Options:
 a. 42
 b. 31
 c. 23
 d. 13

Now, evaluate each choice one by one with reasoning:

Option a: 42
Humans do not have 42 pairs of chromosomes; that would imply 84 individual chromosomes. In humans, the standard count is 23 pairs, totaling 46 chromosomes in most cells. Therefore, 42 as a number of pairs is inconsistent with the established human karyotype and is incorrect.

Option b: 31
There is no basis in human genetics for 31 chromosome pairs. The canonical human chromosome count is 23 pairs, not 31. This option misstates the chromosomal pairing and leads to an incorrect total chromosome number, so it is incorrect.

Option c: 23
This is the correct idea: humans have 23 pairs of chromosomes. Those 23 pairs sum to 46 individual chromosomes in diploid cells, and the concept of pairs is central to how chromosomes are organized during cell division and inheritance. This option aligns with standard human genetics, making it the accurate choice.

Option d: 13
Having 13 pairs would yield 26 chromosomes per cell, which does not match the human karyotype. There is no genetic basis for 13 pairs as the normal count in humans, so this option is incorrect.

Putting the pieces together, the reasoning shows that option c corresponds to the well-established human chromosome pairing count, while the other options conflict with the known human chromosome numbers.

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A human has .… pairs of chromosomes

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