Chiasmata are most appropriately observed in meiosis during :
diakinesis
diplotene
metaphase II
pachytene
B.
diplotene
Chiasmata is observed in meiosis during diplotene, sub stage of Prophase-I. It is the result of crossing over. Each chiasmata is the site of an exchange between chromatids. It is produced by breakage and reunion between any two of the four strands present at each site.
Find out the correct statement
During mitosis endoplasmic reticulum and nucleolus disappear completely at early prophase
Chromosomes are arranged along the equator during prophase of mitosis
Chromosome is made up of two sister chromatids at anaphase of mitosis
A cell plate is laid down during interphase
A cell plate is laid down during interphase
Match the sub-stage of prophase I of meiosis in Column I and the events in Column II and choose the right option.
| Column I | Column II |
| A. Leptotene | 1. Terminalization of chiasma |
| B. Zygotene | 2. Crossing over and recombination |
| C. Pachytene | 3. Synapsis |
| D. Diakinesis | 4. Visibility of chromosomes |
A - 1; B - 2; C - 3; D - 4
A - 1; B - 3; C - 2; D - 4
A - 4; B - 3; C - 2; D - 1
A - 4; B - 1; C - 2; D - 3
A - 4; B - 1; C - 2; D - 3
Which of the following maintain the constant number of chromosomes generation after generation?
Meiosis
Endomitosis
Mitosis
Amitosis
Which one of the following is the significance of mitosis?
Restricted to haploid cells
Cell repair
Increases the genetic variability
Recombination of chromosomes
Recombination of chromosomes
The S-phase of cell cycle is characterized by:
duplication of chromosome
shotening of chromosome
duplication of DNA
duplicatin of centriole
In a typical eukaryotic cell cycle, Gap 1, Synthesis and Gap 2 are the three phases included in the
Prophase
Metaphase
Anaphase
Interphase
Interphase
