Sentences with phrase «splitting of the fertilized egg»

Not exact matches

Conjoined twins form when your fertilized egg does not split completely into two separate balls of cells.

* Birth Defects — Identical or monozygotic twins (from one egg that splits into two) have double the risk of congenital defects of dizygotic twins (from two fertilized eggs).

Human multiple births can occur either naturally (the woman ovulates multiple eggs or the fertilized egg splits into two) or as the result of infertility treatments such as IVF (several embryos are often transferred to compensate for lower quality) or fertility drugs (which can cause multiple eggs to mature in one ovulatory cycle).

And story number 4: Researchers have found a pair of semi-identical twins that came about when two sperm fertilized a single egg, which then split in two to give rise to two individuals.

Twins are normally either identical — the result of a single sperm fertilizing a single egg, which then splits and duplicates itself — or fraternal, developing from two separate eggs fertilized by two separate sperm.

Even their genetic makeup isn't 100 percent identical, but it is highly similar, all because their fertilized egg once split in half and developed as two zygotes instead of one.