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Question
A woman has only daughters. Analyse the situation genetically and provide a suitable explanation.
Solution
In humans, women produce one type of eggs (all with X chromosome) and men produce two types of sperms - 50% with X chromosome and 50% with Y chromosome. All the children of a woman receive X chromosome from her but second sex chromosome which is received from father, can be X or Y. So, the sex is determined by the sex chromosome present in the sperms of the father. If a woman has only daughters, it means father has contributed sperm with X chromosome.
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