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