Question

Place the events in order to form the sequence of events that occur during human reproduction, beginning with fertilization. Source Target = First cleavage of cells Trophoblast becomes the placenta Meiosis completed in egg Embryo grows until it becomes a fetus Implantation into uterine lining Human beta chorionic gonadotropin levels rise = Blastocyst formation = Fertilization

Answer 1

1.Fertilisation(sperms comes in contact with the egg)

2.Meiosis completed in egg(Actually it is meiosis-2 which is being completed after the fertilization)

3.First clevage of cells

4.Blastocyst formation

5.Implantation into uterine lining

6.Human beta chorionic gonadotropin levels rise(cells of trophoblast becomes syncytiotrophoblast which are responsible for the formation of hcg initially and later bwcoming placenta's layer)

7.Trophoblast becomes the placenta

8.Embryo grows until it becomes fetus.