Testcrosses may be used to determine if two genes are linked.

Name: Testcrosses may be used to determine if two genes are linked.
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Testcrosses involve crossing an individual with an unknown genotype (dominant phenotype) with a homozygous recessive individual. If the two genes are linked, the offspring will deviate from the expected 1:1:1:1 ratio, indicating that the genes are physically close together on the same chromosome. Therefore, testcrosses can be used to determine if two genes are linked.

Testcrosses May Be Used to Determine If Two Genes Are