Cell Cycle And Cell Division Question 46
Question: Match the terms (given in column-I) with their explanation (given in column-II) and choose the correct combination from the options given below
Column-I (Terms) Column-II (Explanation) A. Terminalization I. Pairing of homolologous B. Synapsis II. Point of attachment between homologous chromosomes. C. Chiasmata III. Nuclear protein complex that helps in adherence of sister chromatids and then homologous chromosomes. D. Synaptonemal complex IV. Shifting of chiasmata outwards complex towards the ends of a bivalent.
Options:
A) A - IV; B - I; C - II; D - III
B) A-II; B - III; C - IV; D - I
C) A - II; B - IV; C - III; D - I
D) A - IV; B - I; C - III; D - II
Show Answer
Answer:
Correct Answer: A
Solution:
[a] Terminalization which occurs in diakinesis stage of meiosis I, is the disappearance of chiasmata of sliding towards the tips of the chromosomes due to tight condensation.
Synapsis is the pairing of two homologous chromosomes.
It allows matching-up of homologous pairs prior to their segregation, and possible chromosomal crossover between them.
The process of attachment of homologous chromosomes leads to the formation of bivalents.
Chiasmata is a point at which paired chromosomes remain in contact during the first metaphase of meiosis, and at which crossing over and exchange of genetic material occur between the strands.
Synaptonemal complex is formed at the region of synapsis.
It is a protein structure that forms between homologous chromosomes (two pairs of sister chromatids) and is thought to mediate chromosome pairing, synapsis, and recombination.
BETA
