Monozygotic twins:a

occur when two eggs are ovulated.
b. may be of different sexes.
c. have different sets of genes.
d. are called identical twins.
e. result from the fertilization of two sperm cells.


d

Biology & Microbiology

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During development, an XX female embryo will form one of the X chromosomes in each cell into a Barr body. This usually occurs

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