Multiple Choice
Does genetic recombination occur if crossing over happens between sister chromatids during meiosis?
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12. Meiosis
Genetic Variation During Meiosis
Multiple Choice
A cross-over in meiosis is an exchange of genetic material between what structures?
A
Sister chromatids of the same chromosome
B
Centromeres of homologous chromosomes
C
Non-sister chromatids of homologous chromosomes
D
Ribosomal RNA and transfer RNA
Verified step by step guidance1
Understand the process of meiosis: Meiosis is a type of cell division that reduces the chromosome number by half, creating four haploid cells. It involves two rounds of division: meiosis I and meiosis II.
Identify the role of homologous chromosomes: During meiosis I, homologous chromosomes (pairs of chromosomes, one from each parent) line up together. Each chromosome consists of two sister chromatids.
Define cross-over: A cross-over is a process where non-sister chromatids of homologous chromosomes exchange genetic material. This occurs during prophase I of meiosis I, leading to genetic recombination.
Differentiate between sister and non-sister chromatids: Sister chromatids are identical copies of a single chromosome, connected by a centromere. Non-sister chromatids belong to homologous chromosomes and are not identical.
Recognize the significance of cross-over: The exchange of genetic material between non-sister chromatids increases genetic diversity in the resulting gametes, which is crucial for evolution and adaptation.
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