How is linkage used to make gene maps?

Step one: cross two animals that have dissimilar and simply documented phenotypes. Evidence the phenotypes in all the progeny.

Step two: do a DNA test that ways which sets of DNA indicators move jointly in the several descendants.

Step three: associate the DNA map with the phenotypes, and you'll be capable to shape a map that displays which phenotypes communicate to which chromosomal positions.

Crossing over creates new combinations of genes in the gametes that are not found in either parent contributing to genetic diversity

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