kaleesixo kaleesixo

29-11-2016
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the first 22 pairs of chromosomes are homologous in a normal person is that always true for the 23rd pair of chromosomes explain your answer

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kimmycakes kimmycakes

29-11-2016

Not true

the 23rd pair of chromosomes are the sex chromosomes, and they determine the sex of an individual.

Girls have two X chromosomes (XX)

Boys have an X and a Y chromosome (XY)

Therefore, the 23rd pair of chromosomes do not have to be homologous, or the same, if the individual is male

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