It is estimated that humans have between 20,000 and 25,000 genes. Every person has two copies of each gene, one inherited from each parent.

There are 46 chromosomes, half from the mother, half from the father.

Does this mean that there are

a) approximately 20-25,000 genes on the 23 chromosomes inherited from the mother, and 20-25,000 genes on the 23 chromosomes inherited from the father, or

b) approximately 10-12,500 genes on the 23 chromosomes inherited from the mother, and 10-12,5000 genes on the 23 chromosomes inherited from the father?

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Answer A is correct!

The human genome has around 20,000 genes. In both, diploid and haploid chromosome-count, the gene-count stays the same; grown humans have 2 alleles per gene in most of their cells, which is considered 'diploid'. Gametes are haploid.

Willyard, C., Expanded human gene tally reignites debate. Nature, 2018. 558(7710): p. 354-355.

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    $\begingroup$ Please don't encourage posting of "homework" questions which do not show research efforts. $\endgroup$ – mgkrebbs Jun 3 at 18:00
  • $\begingroup$ I did spend quite a lot of time searching for a clear answer to this question. I couldn't find one and that's why I posted the question here. $\endgroup$ – Naj Jun 3 at 18:34
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    $\begingroup$ The aim of stack exchange is to develop an extended topic-related FAQ. I did not find this question here. As this is a natural question that I remember from my own study-years, I really don't care if this is homework; as long as it serves a purpose on the site / for google, it should always be accepted. $\endgroup$ – KaPy3141 Jun 4 at 6:12
  • $\begingroup$ This isn't 'homework' by the way. I'm studying on my own, for myself. PS @KaPy3141 : thank you. $\endgroup$ – Naj Jun 4 at 7:19

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