Multiple Choice QuestionsChiasmata are most appropriately observed in meiosis during :
diakinesis
diplotene
metaphase II
pachytene
During the cell cycle, DNA content is doubled in the
G1 phase
S phase
G2 phase
end of M phase
B.
S phase
Cell cycle is a series of cyclic changes through which a cell passes during its growth and division. In the cell cycle, the resting stage or interphase can be divided into three periods.
G1 phase: RNA and Protein synthesised
S phase: DNA is formed from purines and pyrimidines. The DNA content of nucleus would be doubled.
G2 phase: Synthesis of RNA and protein continues, but DNA synthesis stops.
In meiosis division is
Ist reductional and IInd equational
Ist equational and IInd reductional
both reductional
both equational
Lampbrush chromosomes are seen in which typical stage
mitotic anaphase
mitotic prophase
mitotic metaphase
meiotic prophase
Colchicine prevents the mitosis of the cells at which of the following stage?
Anaphase
Metaphase
Prophase
Interphase
When synapsis is complete all along the chromosome, the cell is said to have entered a stage called
zygotene
pachytene
diplotene
diakinesis
Which of the following maintain the constant number of chromosomes generation after generation?
Meiosis
Endomitosis
Mitosis
Amitosis
Switch
