Question.
Describe the following:
(a) synapsis
(b) bivalent
(c) chiasmata
Draw a diagram to illustrate your answer.
Describe the following:
(a) synapsis
(b) bivalent
(c) chiasmata
Draw a diagram to illustrate your answer.
Solution:
(a) Synapsis
The pairing of homologous chromosomes is called synapsis. This occurs during the second stage of prophase I or zygotene.
(b) Bivalent
Bivalent or tetrad is a pair of synapsed homologous chromosomes. They are formed during the zygotene stage of prophase I of meiosis.
(c) Chiasmata
Chiasmata is the site where two non-sister chromatids of homologous chromosomes have crossed over. It represents the site of cross-over. It is formed during the diplotene stage of prophase I of meiosis.
(a) Synapsis
The pairing of homologous chromosomes is called synapsis. This occurs during the second stage of prophase I or zygotene.
![The pairing of homologous](/media/uploads/2021/12/The-pairing-of-homologous.png)
(b) Bivalent
Bivalent or tetrad is a pair of synapsed homologous chromosomes. They are formed during the zygotene stage of prophase I of meiosis.
![They are formed during the zygotene stage of prophase I of meiosis.](/media/uploads/2021/12/They-are-formed-during-the-zygotene-stage-of-prophase-I-of-meiosis..png)
(c) Chiasmata
Chiasmata is the site where two non-sister chromatids of homologous chromosomes have crossed over. It represents the site of cross-over. It is formed during the diplotene stage of prophase I of meiosis.
![Chiasmata is the site where two non-sister chromatids of homologous chromosomes have crossed over. It represents the site of cross-over. It is formed during the diplotene stage of prophase I](/media/uploads/2021/12/Chiasmata-is-the-site-where-two-non-sister-chromatids-of-homologous-chromosomes-have-crossed-over.-It-represents-the-site-of-cross-over.-It-is-formed-during-the-diplotene-stage-of-prophase-I.png)
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