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Question
Bivalents are formed in meiosis during _________ phase.
Bivalents are formed in meiosis during _________ phase.
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Solution
The correct option is B zygotene
Prophase-I of meiosis is divided into five sub stages - leptotene, zygotene, pachytene, diplotene and diakinesis.
During zygotene, the homologous chromosomes undergo pairing and this is called as synapsis. Synaptonemal complex is formed between the homologous chromosomes. It is a ladder like complex that hold the two homologous chromosomes together. The pair of synapsed homologous chromosomes is called a bivalent or tetrad.
During leptotene, the chromatin (DNA+proteins) which is thread like and loosely coiled starts to condense forming compact structures called chromosomes.
Crossing over occurs during pachytene stage during which there is exchange of genes.
The homologous chromosomes separate during diakinesis and also the nuclelous and nuclear envelope disappear.
Prophase-I of meiosis is divided into five sub stages - leptotene, zygotene, pachytene, diplotene and diakinesis.
During zygotene, the homologous chromosomes undergo pairing and this is called as synapsis. Synaptonemal complex is formed between the homologous chromosomes. It is a ladder like complex that hold the two homologous chromosomes together. The pair of synapsed homologous chromosomes is called a bivalent or tetrad.
During leptotene, the chromatin (DNA+proteins) which is thread like and loosely coiled starts to condense forming compact structures called chromosomes.
Crossing over occurs during pachytene stage during which there is exchange of genes.
The homologous chromosomes separate during diakinesis and also the nuclelous and nuclear envelope disappear.
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