Question
Discuss the sources and expression of variability.
Answer :
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Variability in organisms refers to the differences observed among individuals of the same species. These variations arise due to multiple sources, primarily categorized as genetic and environmental. Genetic variability originates from differences in the genetic material of organisms. One major source is mutation, which involves sudden changes in the DNA sequence, leading to new traits. Mutations can occur spontaneously or be induced by external factors like chemicals, radiation, or viruses. Another source is recombination, which happens during sexual reproduction through processes such as crossing over and independent assortment of chromosomes during
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