In response to the “Change the lens, view the body as a gift’ letter printed on Dec. 12, clarification is needed on the line “when fertilization ...

The debate over when human life begins took a sharp turn in Texas, where a state legislator filed a bill that would define an ...

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 ...