Best stage to observe shape, size and number of chromosomes is
1. interphase
2. metaphase
3. prophase
4. telophase
Synapsis occurs between
1. a male and a female gamete
2. mRNA and ribosomes
3. spindle fibres and centromere
4. two homologous chromosomes
During cell division, the spindle fibres attach to the chromosomes at a region called
1. chromocentre
2. kinetochore
3. centriole
4. chromomere
Meiosis has evolutionary significance because it results in
1. genetically similar daughters
2. four daughter cells
3. eggs and sperms
4. recombinations
Meiosis I:
1. is always followed by interphase
2. is not followed by any period of rest
3. is followed by a period of interkinesis
4. is sometimes followed by interphase
The centrioles replicate during:
1. G1 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 the M-phase, what would be its DNA content at the end of the S-phase?
1. C
2. 2C
3. 3C
4. 4C