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Genetic 342 A&B Kenneth G Wilson Professory of Botany |
Crosses Involving three or more pairs of genes
Example Problem
In Drosophila the following wild type alleles are used for analysis v (vermilion eyes), cv (cross-veinless) and ct (cut or snipped wing edges). Flies doubly recessive and homozygous (v+v+,cvcv,ctct) are crossed with flies singly recessive and homozygous (vv, cv+cv+, ct+ct+). Female progeny that are vv+, cvcv+, ctct+ are then test crossed with the tripley recessive males (vv, cvcv, ctct)
Trihybrid cross Assuming Independent Assortment
There are two possible solutions
This is our friend Oliver the parrotlet, Oliver is a true parrot, the smallest in the world. |