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meiosis becomes significant for the following reasonsconstant number of chromosomesit brings about a reduction in the chromosome number from a
a cleavage furrow appears in the middle of the cell deepens gradually and divides the cell into twothus at the end of second meiotic division four
there is no interphase preceding second meiotic divisionthere is a brief intervening period called interkinesisduring this period there may be
simultaneously with the formation of two daughter nuclei a cleavage furrow appears in the middle of the cell the furrows gradually deepen and divide
- the chromosomes at each pole uncoil and elongate to form the chromatin- a nucleolus reappears at each pole - spindle fibers and asters disappear
- nuclear membrane disorganize at the beginning of this phase- spindle fibers originate and the kinetochore fibers attach to the kinetochore of
diplotenethe paired chromosomes repel each other and begin to separateseparation however is not completed because homologous chromosomes remain
leptontenethe chromosomes becomes visible shorten and thickthe size of the nucleus increasethe homologous chromosomes start getting closer to each
1this is very prolonged phase and differs from the prophase of mitosis because in this chromosomes behave as homologous pairs2each diploid cell has
it is the preparatory phase cell organelle replicate and size of the cell increases dna molecule undergoes replication each chromosome exists as a
regulation of enzymatic action equations for competitive non-competitive uncompetitive inhibition and mixed
chiasmata formation takes place where crossing over occurs here chromatid segments are exchanged which contributes to genetic variability the 46
the process of meiosis in animals is called gametogenesis it takes place in the testis in male and ovary in femalegametogenesis is divided into
divisions of meiosismeiosis is characterized by two nuclear divisions meiosis i and meiosis iibullthe first division is a reduction divisionbullthe
meiosis is the special type of cell division in which the numbers of chromosomes in daughter cell are reduced to half as compared to parent
bullcancer cells do not respond normally to the bodys control mechanismothey divide excessively and invade other tissuesoif left unchecked they can
bullcyclins accumulate during the g1 s and g2 phases of the cell cycle bullby the g2 checkpoint the red bar in the figure enough cyclin is available
rhythmic fluctuations in the abundance and activity of cell-cycle control molecules pace the events of the cell cycle bullkinase - a protein which
the cell cycle is controlled by a cyclically operating set of reaction sequences that both trigger and coordinate key events in the cell cyclebullthe
equal distribution of hereditary materialin mitosis the heredity material is equally distributed in the daughter cell2no change in genetic
cytokinesis in an animal cellsplitting of the cell is called cytokinesis which starts at telophase in animal cells microtubules form a furrow in a
the movement of the chromosome is called anaphase a and the extension of the poles is termed anaphase bthe mechanism of these movements are
metaphase chromosomes each metaphase chromosomes is a duplicated structure which consists of two sister chromatids attached at a point called
phases of karyokinesiskaryokinesis can further be divided into prophase metaphase anaphase and telophase1-prophase pro beforechromatin during
at the beginning of the process in an animal cell the partition of the centriole takes place which has been duplicated during interphase but were in