The ………………. for polyspermy is mediated by the electrical depolarization of egg plasma membrane. 

Progesterone 

How would you define a ligand in cell-to cell signalling

Choose the correct term:

i) The morula/blastocyst implants in the uterine endometrium.

ii) The ICM/trophoblast gives rise to the embryo.

iii) Ectopic pregnancy is the result of implantation inside/outside the uterus. 

How do genetic and environmental defects cause problems in development? 

Choose the correct alternative:

i) The visceral skeleton is also referred to as (chondrocranium/ splanchocranium).

ii) Jaws arose from the (mandibular/hyoid) arch.

iii) The upper jaw is made up of the (palatoquadrate/Meckel’s cartilage).

iv) Branchial basket formed of the visceral arches is found in (teleosts/cyclostomes).

v) If the jaw is attached to the skull and not suspended by the hyomandibula, the suspensorium is (autodiastylic/autostylic)

How is EMT used in the embryo and in the adult?