Chiasmata are formed as a result of
(a) exchange of parts of paired homologous
chromosome
(b) exchange of part of unpaired non-
homologous chromosome
(c) duplication of parts of paired homologous
chromosome
(d) loss of parts of unpaired non-homolog us
chromosome
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Answer:
a. exchange of parts of paired homologus chromosome
Explanation:
it happens in pachytene , but it is clearly seen at diplotene
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(a) exchange of parts of paired homologous chromosome.
Explanation:
The begining of diplotene phase is identify by the dissolution of the synaptonemal complex. The tendency of the recombination of homologous chromosomes of the bivalent to separate from each other except at the site of crossovers. These site of crossover results in X-shaped structure, are called chiasmata. Diplotene can last for months or years, in oocytes of some vertebrates. Hence, chiasmata are formed as a result of exchange of parts of paired homologous chromosome.
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