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  • A woman has only daughters. Analyse the situation genetically and provide a suitable explanation.

A woman has only daughters. Analyse the situation genetically and provide a suitable explanation. 

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Humans have two sex chromosomes, X and Y.
In females, two X chromosomes are present, making it a perfect pair.
But in males, one is a normal-sized X-chromosome while other is a short Y-chromosome.
In humans, sex of the child is determined by chromosome inherited by the father.
If the zygote inherits X chromosome, the zygote will develop into a female.
If the zygote inherits Y chromosome, the zygote will develop into a male.

So, the sex of an infant is determined by the type of sex chromosome contributed by the male gamete.
If a woman has only daughters, this is because the child will have XX pair of sex chromosome.
This indicates that in every fusion, the sperm carrying X-chromosome fertilized the ovum

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