During pachytene, the homologous chromosomes thicken and become recombinant. Crossing over of segments of genetic information occurs between non-sister chromatids of homologous chromosomes, forming exchange sites called chiasmata and resulting in recombination
During metaphase, the kinetochore microtubules pull the sister chromatids back and forth until they align along the equator of the cell, called the equatorial plate.
Diakinesis. the final stage in the first meiotic prophase in gametogenesis, in which the chromosomes achieve their maximum thickness. The chiasmata and nucleolus disappear, the nuclear membrane degenerates, and the spindle fibres form in preparation for the formation of dyads.
Zygotene is the sub-stage where synapsis between homologous chromosomes begins. It is also known as zygonema. These synapsis can form up and down the chromosomes allowing numerous points of contact called 'synaptonemal complex', this can be compared to a zipper structure, due to the coils of chromatin.
Match the stages of meiosis in Column I to their characteristic features in Column II and select the correct option using the codes given below:
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Q4
Match the stages of mitosis with the events happening in them. Column AColumn B(a) Prophase(i) Chromosomes arranged on equatorial plate(b) Metaphase(ii) Formation of nuclear membrane(c) Anaphase(iii) Condensation of chromosomes(d) Telophase(iv) Spindle fibres pull chromatids
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Q5
Match Column-I with Column-II and select the correct option from the codes given below.