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Meiosis, which occurs during sexual reproduction, allows for a great variety of possible gene combinations. Which of the following can increase genetic variation during meiosis?

A. the deletion of a gene caused by an error in chromosomal crossover
B. the transposition of a gene from one place in an organism's genome to another
C. the exchange of genes during chromosomal crossover
D. the duplication of a gene caused by an error in chromosomal crossover

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articunojaz
I believe the answer to this is D. 
dilirba1227p34scl
I would say it is C since genetic variations occurs during crossovers so if genes are exchanged there would be more genetic variation. Hope this helps