%@LANGUAGE="JAVASCRIPT" CODEPAGE="1252"%>
Genetic 342 A&B Kenneth G Wilson Professory of Botany |
Assuming independent assortment
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)
P1=v+v+,cvcv,ctct x vv, cv+cv+, ct+ct+
F1 =Wild Type - V+V, cv+cv, ct+ct x vv, cvcv, ctct (gametes v, cv, ct)
F1 gamete types | exp | obs | ||
v |
cv+ |
ct+ |
181 | 580 |
v+ |
cv |
ct |
181 | 592 |
v |
cv |
ct+ |
181 | 45 |
v+ |
cv+ |
ct |
181 | 40 |
v |
cv |
ct |
181 | 89 |
v+ |
cv+ |
ct+ |
181 | 94 |
v |
cv+ |
ct |
181 | 3 |
v+ |
cv |
ct+ |
181 | 5 |
1448 |
This is our friend Oliver the parrotlet, Oliver is a true parrot, the smallest in the world. |