<%@LANGUAGE="JAVASCRIPT" CODEPAGE="1252"%> 3 point linkage

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

oliver

This is our friend Oliver the parrotlet,

Oliver is a true parrot,

the smallest in the world.