The longer the chromosome of an organism, the more genetic variability it gets from

Independent assortment

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Linkage

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Crossing

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Mutation

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Solution

The correct option is C Crossing
Chromosomal crossover (or crossing over) is the exchange of genetic material between homologous chromosomes that results in recombinant chromosomes. It is one of the final phases of genetic recombination, which occurs during prophase I of meiosis during a process called as synapsis.
More genetic variability is possible by the cross over process where the chromosomal exchange of genetic materials become possible.

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___________ is a technique in which genetic constitution of an organism is altered by introducing new genes into its chromosomes.

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