Options are not provided in the question. The complete question is as following:
Recombination between linked genes comes about for what reason?
A) Nonrecombinant chromosomes break and then rejoin with one another.
B) Independent assortment sometimes fails.
C) Linked genes travel together at anaphase.
D) Crossovers between these genes result in chromosomal exchange.
Answer: D) crossovers between these genes result in chromosomal exchange
Explanation:
If two genes on the same chromosome are close together, they don't assort separately and are said to be related together that performs recombination. While recombination, chromosomes undergo crossover and exchange the genetic material between two homologous non-sister chromosomes, resulting in recombinant chromosomes in the course of sexual reproduction.
Hence, the correct answer is D.
