Extrusion of second polar body from egg nucleus occurs:
After entry of sperm, but before completion of fertilization
After completion of fertilization
Before entry of sperm
Without any relation of sperm entry
Termination of gastrulation is indicated by:
Obliteration of blastocoel
Obliteration of archenteron
Closure of blastopore
Closure of neural tube
Meroblastic cleavage is division:
Horizontal
Partial / parietal
Total
Spiral
How many sperms are formed from a secondary spermatocyte?
4
8
2
1
Blastopore is:
Opening of neural tube
Opening of gastrocoel
Future anterior end of embryo
Found in blastula
Amount of yolk and its distribution are changed in the egg. Which one is affected ?
Pattern of cleavage
Formation of zygote
Number of blastomeres
Fertilization
The mammalian corpus luteum produces:
Estrogen
Progesterone
Luteotropic hormone
Luteinizing hormone
Human eggs are:
Alecithal
Microlecithal
Mesolecithal
Macrolecithal
Middle piece of mammalian sperm possesses:
Mitochondria and centriole
Mitochondria only
Centriole only
Nucleus and mitochondria
Gonads develop from embryonic:
Ectoderm
Endoderm
Mesoderm
Both (b) and (c)
