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प्रश्न
The progeny of a sexually reproducing organism is never the replica of the parents in all respects. Mention any three factors that cause this variation.
लघु उत्तर
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उत्तर
Genetic variation in species that reproduce sexually mainly occurs because parental genes are rearranged into new combinations, creating unique genotypes in the offspring. The primary causes of this variation include: (1) the independent assortment of chromosomes during meiosis; (2) the process of crossing over, where linked genes on chromosomes exchange segments during prophase I of meiosis; and (3) the random nature of gamete fertilization. Therefore, the offspring of sexually reproducing organisms are never exact genetic copies of their parents.
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