Question

Describe the different phases of meiotic prophase – I. Mention the chromosomal events during each stage.​

Answer 1

Most of the events that function to differentiate meiosis from mitosis occur in Prophase. Homologous chromosomes form bivalents (or tetrads) and crossing over occurs between non-sister chromatids

Prophase I is divided into 5 distinctive sub-stages:

• Leptotene – The chromosomes begin to condense and are attached to the nuclear membrane via their telomeres

• Zygotene – Synapsis begins with a synaptonemal complex forming between homologous chromosomes

• Pachytene – Crossing over of genetic material occurs between non-sister chromatids

• Diplotene – Synapsis ends with disappearance of synaptonemal complex; homologous pairs remain attached at chiasmata

• Diakinesis – Chromosomes become fully condensed and nuclear membrane disintegrates prior to metapha

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Answer 2

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Most of the events that function to differentiate meiosis from mitosis occur in Prophase. Homologous chromosomes form bivalents (or tetrads) and crossing over occurs between non-sister chromatids

Prophase I is divided into 5 distinctive sub-stages:

• Leptotene – The chromosomes begin to condense and are attached to the nuclear membrane via their telomeres
• Zygotene – Synapsis begins with a synaptonemal complex forming between homologous chromosomes
• Pachytene – Crossing over of genetic material occurs between non-sister chromatids
• Diplotene – Synapsis ends with disappearance of synaptonemal complex; homologous pairs remain attached at chiasmata
• Diakinesis – Chromosomes become fully condensed and nuclear membrane disintegrates prior to metapha