alleryStart learning →A single crossover event exchanges equivalent DNA between:
ATwo separate daughter cells
BTwo sister chromatids
CTwo non-sister chromatids
DTwo unrelated chromosomes
Answer & Solution
Correct answer: C. Two non-sister chromatids
1. Crossing over happens while the homologues are paired in synapsis.
2. It swaps matching stretches between the maternal and the paternal copy.
3. A single crossover event between homologous non-sister chromatids leads to a reciprocal exchange of equivalent DNA between a maternal chromosome and a paternal chromosome.
4. Sister chromatids are near-identical copies, so exchanging between them would change nothing.
_Source: OpenStax Biology for AP(R) Courses (CC BY 4.0), Ch 11 'Meiosis and Sexual Reproduction', sections 11.1-11.2_
Keep practising Meiosis and Sexual Reproduction
Browse all Meiosis and Sexual Reproduction questions for AP Biology, or explore more Biology topics.
Related questions
Complete the variation ruleTrue or false: meiosisCount the meiosis numbersMatch each meiosis term to its meaningFollow a cell through meiosisMitosis or meiosis?Sister chromatids are held together at the centromere by which proteins?Comparing life cycles, the dominant stage is diploid in most animals but in fungi it is: