The centrioles replicate during:
1. G phase
2. S phase
3. G2 phase
4. Early prophase
Bivalent chromosomes clearly appear as tetrads during:
1. Zygotene
2. Pachytene
3. Diplotene
4. Diakinesis
The beginning of diplotene is recognized by :
1. appearance of recombination nodules
2. Crossing over
3. Dissolution of synaptonemal complex
4. Appearance of chiasmata
Consider the given two statements:
l. During G1 phase the cell is metabolically active and continuously grows but does not replicate its DNA.
ll. During G2 phase, proteins are synthesized in preparation for mitosis while cell growth continues.
Of the two statements:
1. Only l is correct
2. Only ll is correct
3. Both l and ll are correct
4. Both l and ll are incorrect
If the DNA content of an onion tip cell is 2C at the end of M phase, what would be its DNA content at the end of S phase?
(1) C
(2) 2C
(3) 3C
(4) 4C
In oocyte of some vertebrates, the stage of meiosis I that can last for months or years would be:
(1) Zygotene
(2) Pachytene
(3) Diplotene
(4) Diakinesis
At what phase of meiosis are homologous chromosomes separated ?
1. Prophase l
2. Prophase ll
3. Anaphase l
4. Anaphase ll
During meiosis, the sister chromatids separate during:
(1) Anaphase II
(2) Anaphase I
(3) The S phase
(4) Synapsis
During meiosis I in human, one of the daughter cells receives:
(1) Only maternal chromosomes
(2) A mixture of maternal and paternal chromosomes
(3) The same number of chromosomes as a diploid cell
(4) A sister chromatid from each chromosome
Chromosomes decondense into diffuse chromatin:
(1) At the end of telophase
(2) At the beginning of prophase
(3) At the end of interphase
(4) At the end of metaphase