SSC
BIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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What is a chiasma?
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A point where homologous chromosomes remain in contact during meiosis
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A point where gene mutations occur
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A point where the recombination of genetic material always occurs
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A process of exchanging genes between non-homologous chromatids
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Explanation:
Detailed explanation-1: -The chiasma is a structure that forms between a pair of homologous chromosomes by crossover recombination and physically links the homologous chromosomes during meiosis.
Detailed explanation-2: -Chiasmata is formed in the Diplotene phase of prophase 1. Note: In the prophase I of meiosis crossing over take place. The point at which the crossing over takes place is called the chiasmata.
Detailed explanation-3: -During synapsis, homologous chromosomes physically connect at crossing points called chiasma. At each chiasma, genetic recombination between maternal and paternal homologous chromosomes occurs in a process called crossing over. Crossing over cannot happen unless synapsis is in effect.
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