Crossing over does not occur between genes that are far apart from each other on a chromosome. Thus option A is correct.
The process in which exchange of genetic material between non-sister chromatids of homologous chromosomes during meiosis occur called as crossing over.
In this process two new allelic combinations in the daughter cells are formed.
Three types of crossing over occur such as Single Crossing Over where only one chiasma is formed between the non-sister I chromatids.
In Double Crossing Over two chiasmata are formed.
In multiple Crossing Over three or more chiasmata are formed in the-tetrad.
Thus option A is correct.
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