A Level Biology Practice Exam

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What are recombinant chromatids?

Chromatids that are identical to each other
Chromatids with a combination of DNA from both homologous chromosomes
Chromatids that have not undergone crossing over
Chromatids that are visible under light microscopy

The correct answer is: Chromatids with a combination of DNA from both homologous chromosomes

Recombinant chromatids occur as a result of genetic recombination during meiosis, specifically through a process called crossing over. During this process, homologous chromosomes exchange segments of their genetic material, leading to chromatids that carry a mixture of alleles from both parents. As a consequence, the chromatids are no longer identical to one another, and they contain different combinations of DNA. This genetic variability plays a critical role in evolution and the adaptability of species. The nature of recombinant chromatids is pivotal in the context of inheritance, as they contribute to genetic diversity in gametes, which is essential for sexual reproduction. The correct answer reflects this process, illustrating the significance of crossing over in generating genetic variation among offspring.