AP BIOLOGY

Detailed explanation-1: -Embryology is important to understanding a species’ evolution, since some homologous structures can be seen only in embryo development. For example, all vertebrate embryos, from humans to chickens to fish, have a tail during early development, even if that tail does not appear in the fully developed organism.

Detailed explanation-2: -1. Fertilization. Fertilization is the union of the female gamete (egg) and the male gamete (spermatozoa). Whether it occurs naturally inside the female reproductive system or with the assistance of reproductive technologies outside of the human body, the product is a structure called a zygote.

Detailed explanation-3: -Embryology is the branch of biology that investigates the formation of gametes (sex cells) before fertilization, as well as the fertilization and development of embryos and fetuses, and organisms.

Detailed explanation-4: -Human Embryology and Developmental Biology is the study of the fascinating process in humans and animals that turns a single fertilised egg into a whole new individual with all the many specialised cell types.