Which of the following is/are the cytoplasmic director of cell destiny during development?
a) animal pole
b) vegetal pole
c) grey crescent
d) all of these
Explanation: The Grey crescent is the area of the region opposite the sperm entrance that formed a melanin-rich place:
Normal cleavages divide the zygote through the………in fertilized frog.
a) animal pole
b) vegetal pole
c) grey crescent
d) all of these
Explanation: so each daughter cell receives an equal share of the components in the cytoplasm
What will happen if the gray crescent divided between two daughter cells?
a) two normal tadpoles will produced
b) one normal tadpole and one undifferentiated ball of cells will produced
c) two balls of undifferentiated cells will produced
d) none of these
What will happen if the gray crescent entirely included in one cell and other cell did not receive its part?
a) two normal tadpoles will produced
b) one normal tadpole and one undifferentiated ball of cells will produced
c) two balls of undifferentiated cells will produced
d) none of these
Explanation: cytoplasmic components contain different morphogenetic determinant that are responsible for cell differentiation
The morphogenetic determinants are present in………
a) trophoblasts
b) epiblasts
c) hypoblasts
d) blastomeres
The fertilized egg of ascidians contains cytoplasm of……..colors that are segregated into different blastomeres.
a) two
b) three
c) four
d) five
Explanation: clear, yellow, grey and grey equatorial cytoplasm
