The zygote inherits two fully active X chromosomes and begins re-inactivation of the paternal X chromosome (XP) at the 4- to 8-cell stage. In the trophectoderm (extra-embryonic cells, shown in ...
Changes in either chromosome structure or number can occur during ... each parent contributes 23 chromosomes to the zygote through a process of chromosomal reduction called meiosis (Fig 1).
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