Question

2. Describe the major developments of the germinal, embryonic, and fetal stages of development. Discuss two common teratogens and their effects on the developing fetus. At what point(s) in pregnancy are teratogens most dangerous?

Answer 1

Geminal stage colle The two week period after conception is called Geminal stage. About 36 hours of conception the zygote begins to develop quickly . Embryonic stage Implantation , the division of germ layers and organogenesis. Implantation as the burrowing of the Embryo fetal Stage :- from the ath week until the birth is known as fetal stage. CS Cann

Common Teratogens Alcohol fetal alcohol syndrome Intrauterine Growth retardation, microcephaly o odrad © Ethisterone, Norethisterone Varying degrees of masculinization of female fetuses potleston Nicotine (cigarettes) leads to Premature delivery and affect fetal Growthor ) > Embryonic stage is most susceptible to tematogenic effect and din dangerous it leads to rapid differentiation (or) periods. pored CamScannerud For Scanned with