Multiple Choice
What happens during crossing over in meiosis?
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12. Meiosis
Genetic Variation During Meiosis
Multiple Choice
Does genetic recombination occur if crossing over happens between sister chromatids during meiosis?
A
Yes, but only if the sister chromatids are from different homologous chromosomes.
B
No, genetic recombination only occurs between non-sister chromatids.
C
No, genetic recombination does not occur between sister chromatids.
D
Yes, genetic recombination occurs between sister chromatids.
Verified step by step guidance1
Understand the concept of sister chromatids: Sister chromatids are identical copies of a single chromosome, formed during DNA replication. They are connected by a centromere.
Learn about crossing over: Crossing over is a process during meiosis where homologous chromosomes exchange genetic material. This typically occurs between non-sister chromatids of homologous chromosomes.
Distinguish between sister and non-sister chromatids: Non-sister chromatids belong to homologous chromosomes, which are similar but not identical. Sister chromatids are identical copies of the same chromosome.
Recognize the role of genetic recombination: Genetic recombination increases genetic diversity and usually involves the exchange of DNA between non-sister chromatids during meiosis.
Conclude why genetic recombination does not occur between sister chromatids: Since sister chromatids are identical, crossing over between them does not result in new genetic combinations, hence no genetic recombination.
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