A dihybrid test cross can reveal gene linkage, with deviations from a 1:1:1:1 ratio indicating linkage and a 1:1 ratio signifying complete linkage.
Gene linkage can be detected using a dihybrid test cross; deviations from a 1:1:1:1 ratio indicate linkage, while only parental types (1:1) suggest complete linkage.
| Front | Experiment that can be used to detect gene linkage |
|---|---|
| Back | Dihybrid Test Cross (cross a heterozygous individual for two traits with an individual that is recessive for both traits) • If all 4 types of offspring are produced in same proportion, then there is no linkage at all. • If there is some deviation from the ideal 25% ratio, then partial/incomplete linkage is present. • If only parental types are produced (1:1:0:0), then there is complete/tight linkage. |
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