Question

17. Why doall gametes formed in human females have an X chromosomes ?​

Answer 1

Answer:

In human female sex chromosome is homomorphic that is same sex chromosome (XX ) while male is heteromorphic (XY). So during sexual reproduction when female gamete is formed inside female body that is inside eggs all cell will get one copy of XX chromosome. So each female gamete has one copy of X chromosome. 

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Answer 2

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All the gametes formed in human females have an 'X' chromosome because during meiosis at the time of gamete formation, one X chromosome enters each gamete.