How many chromosomes do humans have?

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1 fertility expert(s) answered this question

Answer from: Douglas Lester, PhD, MSc, BSc (Hons)

Geneticist, Co-Founder & Chief Scientific Officer Fertility Genomics
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It is a different answer for males and females they go because obviously, we’re different [inaudible 0:13] physiologically and genetically. Females normally have 22 pairs of chromosomes, numbered 1 to 22. The largest chromosome is number one, and the smallest chromosome is number 22. In addition to these, females have 2 X chromosomes called sex chromosomes. Males also have 22 pairs of chromosomes, and they only have a single X chromosome. But they have an additional male-specific Y chromosome.

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Human chromosomes - how many do we have?

Normally, human cells have 23 pairs of chromosomes, with a total of 46 chromosomes in each cell. Any alteration in the number of chromosomes can cause problems with a baby’s growth, development, and function of the body systems. Such changes in the chromosome number can happen when the reproductive cells are formed (eggs and sperm), in the early development of the fetus, or in even in any body cell after birth. If the chromosomes exceed the normal number 46, this is called aneuploidy.

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