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Immediate cause of variations of :
Immediate cause of variations of :
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The correct option is B Recombinations
Recombination is the exchange of DNA segments between homologous chromosomes. This shuffling of genes brought about by genetic recombination produces increased genetic variation. During fertilisation, 1 gamete from each parent combines to form a zygote. Because of recombination and independent assortment in meiosis, each gamete contains a different set of DNA. This produces a unique combination of genes in the resulting zygote. Though mutation is the ultimate cause of variations but it takes time to appear as variation at the population level.
So, the correct answer is 'Recombinations'
Recombination is the exchange of DNA segments between homologous chromosomes. This shuffling of genes brought about by genetic recombination produces increased genetic variation. During fertilisation, 1 gamete from each parent combines to form a zygote. Because of recombination and independent assortment in meiosis, each gamete contains a different set of DNA. This produces a unique combination of genes in the resulting zygote.
Though mutation is the ultimate cause of variations but it takes time to appear as variation at the population level.
So, the correct answer is 'Recombinations'
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