alleryStart learning →Crossover events are described as which source of genetic variation in meiosis?
AThe second source
BThe third source
CThe fourth source
DThe first source
Answer & Solution
Correct answer: D. The first source
1. Meiosis introduces variation in more than one way.
2. The earliest of them happens in prophase I, while the homologues are paired.
3. The crossover events are the first source of genetic variation in the nuclei produced by meiosis.
4. Independent assortment at the metaphase plate is the second mechanism.
_Source: OpenStax Biology for AP(R) Courses (CC BY 4.0), Ch 11 'Meiosis and Sexual Reproduction', sections 11.1-11.2_
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