A) XY- chromosomes
B) two X- chromosomes
C) one Y- chromosome
D) one X- chromosome
Correct Answer: D
Solution :
When released from ovary, ovum contains only one X-chromosome. It is spherical and carries a haploid set of maternal chromosomes. It also contains large amount of cytoplasm. The chromosome number becomes haploid by meiosis. When released from testes the sperm contains either one X-chromosome or one Y-chromosome.
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