Question

Remember that in humans 2n = 46. What fraction of a man’s gametes contains centromers all of which were inherited from the same parent of that person? (it can be the dad or the mom of that guy, does not matter)

Answer 1

Gametes are haploid cells, the haploid number is n = 23, and each parent could provide half of the centromeres. Hence, the fraction of a man’s gametes that contain centromeres inherited from the same parent is 1/2²³.

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We know that the diploid number in humans is 2n=46. This means that the haploid number is n=23.

We need to know the fraction of a man’s gametes that contains centromers inherited from the the father or the mother.

A gamete has 23 chromosomes.

Half of the centromers could be inherited by the father (1/2) and half by the mother (1/2).

So the fraction should be 1/2ⁿ = 1/2 ²³

• 1/2 because half of the centromers could be inherited by the father or the mother
• n because is the haploid number of chromsomes in the gamete ⇒ n = 23

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