Which one of the following generates new genetic combinations leading to variation?

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Question

Which one of the following generates new genetic combinations leading to variation?

Accepted Answer

Correct Answer: A — Sexual reproductionStep-by-step Solution:Sexual reproduction involves two key events that generate genetic variation: meiosis (which produces haploid gametes through crossing over and independent assortment) and fertilization (random fusion of gametes). Together, these processes create new combinations of alleles in the offspring, leading to genetic variation.Why other options are incorrect:Option B is incorrect because nucellar polyembryony is an asexual (apomictic) process where embryos develop from nucellus cells (maternal tissue) without fertilization, producing genetically identical clones. Option C is incorrect because vegetative reproduction involves mitosis, producing offspring identical (clones) to the parent. Option D is incorrect because parthenogenesis is development from an unfertilized egg — it may involve meiosis but without fertilization, resulting in limited or no new recombination.Key Concept: Sexual reproduction is the only mode that consistently generates genetic variation through meiotic recombination (crossing over), independent assortment, and random fertilization. Variation is the raw material for evolution by natural selection.

Which one of the following generates new genetic combinations leading to variation?

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Which one of the following generates new genetic combinations leading to variation?

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