The fusion of sperm and egg gametes during human fertilization establishes a diploid zygote and initiates a series of cell divisions that result in a multicellular embryo. The blastocyst stage is ...

The zygote that results from fertilization inherits one nuclear allele of each gene from each parent (that is, at the three example loci, it is Aa, Bb and Cc). By contrast, the cytoplasmic ...

Your little zygote has now officially turned into an embryo. About eight weeks after fertilization (roughly week 10 of pregnancy), the embryo will turn into what’s known as a fetus. From there ...