Question

The knowledge of cross-over percentage is of importance to scientists as it ______.

Options

• proves that genes are the DNA in chromosomes

• makes possible the mapping of chromosomes

• enables certain gene frequencies to increase in a population

• neutralizes the effect of linkage

Answer 1

The knowledge of cross-over percentage is of importance to scientists as it makes possible the mapping of chromosomes.

Explanation:

The knowledge of cross-over percentage is important because it directly reflects the frequency of recombination between gene loci on a chromosome. This frequency is proportional to the distance between genes, enabling scientists to establish gene order and relative distances on chromosomes, thus making chromosomal mapping possible. Essentially, cross-over percentages provide a measure to build a chromosome map by indicating how far apart genes are from each other along the chromosome.