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Biology 21 Online
OpenStudy (anonymous):

A child is born with two X chromosomes and one Y chromosome. How would a biologist describe the different possible ways this could have happened during the production of sperm and/or egg by the child’s parents?

OpenStudy (aaronq):

non-disjunction during meiosis I?

OpenStudy (anonymous):

According Lyon hypothesis One eggs of female is inactive and the remaining one egg released.in this condition male also release both x and y..

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