Which of the following leads to formation of polytene chromosomes?
a) Nondisjunction of chromatids during meiosis
b) Sister chromatid exchange
c)Recombination between adjacent chromosome segments
d) Repeated replication without separation of chromatids
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Answer:
d) Repeated replication without separation of chromatids.
Explanation:
Polytene chromosomes are formed when there is duplication of each chromatid without their segregation. The newly formed chromatids remain associated and together form a cable like structure referred to as polytene chromosomes.
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