Answer:
e. separate chromosomes during cell division.
Explanation:
The formation of the spindle apparatus starts in the prophase stage of mitosis. The spindle is made of microtubules. The kinetochore microtubules become attached to kinetochores of the centromeres of chromosomes. This attachment helps in the alignment of the chromosome at the cell's equator during metaphase. Depolymerization of kinetochore microtubules shorten them and thereby assist in the separation of sister chromatids to opposite poles during anaphase.
A cell that is unable to polymerize microtubules will not be able to form a spindle apparatus during mitosis. Chromosomes would not be aligned at the equator in metaphase and there will not be the separation of sister chromatids to the opposite poles of the cell during anaphase.
Answer:
temperature and precipitation
Explanation:
Answer:
The cytoplasm of the egg cell is same as like that of the ordinary cell's cytoplasm.
It has yolk in its center which contains nucleus, nucleolus and germinal spot.
The mammalian ova contains a small amount of nutritive yolk which provides the nourishment to the embryo for a time being.
The cytoplasm of the unfertilized egg contains some unevenly distributed proteins, specifically the cytoplasmic determinants.
These determinants are the substances that plays a major role in the oocyte formation and maturation. Sometimes they are clumped together and then divided heterogenitically.
