Three germ layers are formed during which stage of Embryonic development.
After blastocyst form in Blastulation with totipotent stem cell than germ layers form.
Movement of blastomeres usually seen in which Embryonic stage :-
Once trophoblast form cells of blastomere move
The first movements of the foetus and appearance of hair on the head are usually observed during the :-
The first movements of the foetus and appearance of hair on the head are usually observed during the fifth month
In which stage rate of cell-division decrease?
As gastrulation occur rate of cell division decrease
Fate map of embryo is prepared in which stage?
A fate map is a diagram of an egg or blastula, indicating the fate of each cell or region, at a later stage of development. Fate maps are essential tool in most embryological experiments.
Solid ball of cell produced by repeated cleavage is called
Mitotic division in Zygote lead to formation of Morula
Gastrulation is a process
In gastrulation differentiation of germ layer occur
The first indication of division of labour in the blastomeres appear at
Germ layers first form in gastrulation
Sexually reproducing multicellular animals start their development from -
Zygote is first stage after fertilization which undergo mitosis
Correct sequence in development is -
Fertilization lead to zygote formation followed by Morula, blastocyst and Gastrula
Preparation of cell differentiation are completed in-
Blastula also have totipotent stem cell
What is true for cleavage :-
With each division size of cell keep on decreasing as growth not occur
Cleavage start in human in
Fertilization occur in fallopian tube in ampulla region at same location Cleavage start
Type of cleavage in an egg is determined by :
Yolk is stored food material on the basis of type of division depend after fertilization
Identical twins will be produced when :
After zygote start Cleavage cells are known as Blastomere and if they separate and can get implanted with two embryo
Division of human egg is :
Since yolk absent so division is holoblastic Equal
The embryo with 8 to 16 blastomeres is called :
Zygote divide to form 8-16 cell stage known as morula
Function of placenta is :-
Placenta exchange gases and remove waste from foetus
Stem cells are found in :-
In blastocyst the inner cell mass is totipotent stem cell and it undergo division and differentiation
The first sign of growing foetus may be noticed by :-
The first sign of growing foetus may be noticed by listening to the heart sound carefully through the stethoscope
During pregnancy only which hormones are secreted in women :-
hPL secretion occur from placenta
Placenta contains :-
Both Maternal and Chorionic villi Contribute
During Implantation, the blastocyst becomes embedded in the which layer of the uterus.
Endometrium is part of uterus which is layer with blood vessels in which implantation occur
Mammalian placenta originates from :
Human placenta is Develop from Allantois and Chorion