During crossing over, exchange of segments takes place between:
Correct answer: B. Non-sister chromatids of homologous chromosomes
- A. Sister chromatids of homologous chromosomes
- B. Non-sister chromatids of homologous chromosomes
- C. Non-sister chromatids of non-homologous chromosomes
- D. Sister chromatids of non-homologous chromosomes
Explanation
The correct answer is B. During meiosis, homologous chromosomes undergo a process called synapsis, where they align closely. Crossing over occurs between non-sister chromatids of these homologous chromosomes, leading to an exchange of genetic material. This genetic recombination is crucial for genetic diversity. Options C and D are incorrect because crossing over does not involve non-homologous chromosomes. Option A is incorrect as sister chromatids are identical and do not exchange segments in this context.
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About Inheritance
Mendel's laws explain segregation, independent assortment and the prediction of genetic ratios using alleles, genotypes and phenotypes. The chapter also covers linked genes, recombination and crossing over during meiosis, then applies pedigree reasoning to X-linked recessive traits, which show different inheritance patterns in males and females.
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