General Science • BiologyMedium
What is the primary genetic consequence of meiotic crossing over occurring between non-sister chromatids of homologous chromosomes during prophase I?
A. Recombination of linked genes leading to novel allele combinations in gametes✓ Correct Answer
B. Exact duplication of all maternal chromosomes without any alteration in nucleotide sequence
C. Permanent nondisjunction leading to monosomy in all resulting daughter cells
D. Complete elimination of paternal genetic material during anaphase separation
💡 Solution & Explanation
Crossing over during prophase I of meiosis involves the physical exchange of chromosome segments between non-sister chromatids of homologous pairs, resulting in genetic recombination that produces novel allele combinations and enhances biodiversity in sexually reproducing organisms. Incorrect options suggest replication errors or chromosomal loss rather than orderly recombination. Homologous recombination is essential for proper chromosome segregation during meiotic divisions.
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