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Crossing over leads to recombination of genetic material on the two chromosomes. Mutation results in alternation of DNA sequences and consequently results in change in the genotype and the phenotype of an organism. In addition to recombination, mutation is another phenomenon that leads to variation in DNA.

1. Crossing over leads to recombination of genetic material on the two chromosomes.
2. Mutation results in alternation of DNA sequences.
3. Mutation leads to variation in DNA.
4. Crossing over and mutation are unrelated phenomena.

Correct answer: Mutation leads to variation in DNA.

Solution

The passage explicitly says that, in addition to recombination, mutation is another phenomenon that leads to variation in DNA. That makes the statement about mutation causing variation in DNA the correct choice.

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