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
Cells become variable in morphology and function in different regions of the embryo. The process is:
Differentiation
Metamorphosis
Organization
Rearrangement
Eye lens is formed from:
Ectoderm
Mesoderm
Endoderm
Both (a) and (b)
Egg is liberated from ovary in:
Secondary oocyte stage
Primary oocyte stage
Oogonial stage
Mature ovum stage
Freshly released human egg has:
One Y-chromosome
One X- chromosome
Two-X chromosome
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.
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
Extra-embryonic membranes of the mammalian embryo are derived from:
Inner cell mass
Trophoblast
Formative cells
Follicle cells
Blastopore is:
Opening of neural tube
Opening of gastrocoel
Future anterior end of embryo
Found in blastula
Human eggs are:
Alecithal
Microlecithal
Mesolecithal
Macrolecithal
