Continuous variations are attributed to

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(D) Continuous variations are small,gradual,and cumulative changes in the phenotype of an organism. These variations are primarily caused by the recom

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Crossing over

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(D) Continuous variations are small,gradual,and cumulative changes in the phenotype of an organism. These variations are primarily caused by the recombination of genes during meiosis,specifically through the process of crossing over between homologous chromosomes. Unlike mutations,which cause sudden and discontinuous changes,crossing over leads to new combinations of alleles,resulting in a continuous spectrum of traits within a population.

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