Extra-embryonic membranes of the mammalian embryo are derived from:
Inner cell mass
Trophoblast
Formative cells
Follicle cells
Eye lens is formed from:
Ectoderm
Mesoderm
Endoderm
Both (a) and (b)
How many sperms are formed from a secondary spermatocyte?
4
8
2
1
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
Gonads develop from embryonic:
Both (b) and (c)
What is true about cleavage in fertilized egg of human ?
Meroblastic
Starts when egg reaches uterus
Starts in fallopian tube
It is identical to normal mitosis
The mammalian corpus luteum produces:
Estrogen
Progesterone
Luteotropic hormone
Luteinizing hormone
Meroblastic cleavage is division:
Horizontal
Partial / parietal
Total
Spiral
At the end of first meiotic division, male germ differentiates into:
Secondary spermatocyte
Primary spermatocyte
Spermatogonium
Spermatid
During cleavage, what is true about cells?
Nucleocytoplasmic ratio remains unchanged.
Size does not increase.
There is less consumption of oxygen.
The division is like meiosis.
