How many chromosomes does a person have?

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Prepare for the GMAS 5th Grade Science Test. Use flashcards and multiple choice questions, each question offers hints and explanations. Ace your exam preparation!

Multiple Choice

How many chromosomes does a person have?

Explanation:
Humans have 46 chromosomes in most of their body cells. These appear as 23 pairs: 22 pairs of autosomes and 1 pair of sex chromosomes (XX or XY). When a sperm cell and an egg cell combine at fertilization, each contributes 23 chromosomes, giving the new individual a total of 46. The number 23 refers to the chromosomes in gametes, not in typical body cells, which is why 46 is the correct count for a person. The other totals listed don’t match the usual chromosome set for a person.

Humans have 46 chromosomes in most of their body cells. These appear as 23 pairs: 22 pairs of autosomes and 1 pair of sex chromosomes (XX or XY). When a sperm cell and an egg cell combine at fertilization, each contributes 23 chromosomes, giving the new individual a total of 46. The number 23 refers to the chromosomes in gametes, not in typical body cells, which is why 46 is the correct count for a person. The other totals listed don’t match the usual chromosome set for a person.

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