Crossing over is a source of variation because:

Chromosomes are swapped during crossing over

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Part of DNA is exchanged during crossing over

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Due to exchange, genes are redistributed

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Redistributed genes give new combinations

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Solution

The correct options are
B Part of DNA is exchanged during crossing over
C Due to exchange, genes are redistributed
D Redistributed genes give new combinations
Meiosis provides a mechanism that ultimately results in variation. During initial phases of meiosis, parts of DNA are exchanged with other parts. Such an exchange causes redistribution of genes. When such chromsomes are transmitted to next generation, they cause expression of new combinations. These are the variations.

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Besides crossing over, which other process in meiosis helps in bringing about variation?

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