Mention the significance of crossing over phenomenon occurring during meiosis I.
GeneralClass 12AllAnswered 27 Mar 2026
Answer
Crossing over introduces genetic recombination by exchanging DNA segments between non-sister chromatids of homologous chromosomes, generating genetic variation in offspring.
Explanation:
- Occurs during pachytene of prophase I
- Chiasmata mark crossover sites
- Produces recombinant chromatids with new allele combinations
- Essential for evolution and biodiversity
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