You conduct a series of two-point mapping crosses involving five genes located on chromosome III and obtain the following percentage of recombinant offspring:
h-cu eyg-h eyg-cu rai-eyg rai-h rai-cu th-cu th-h th-eyg th-rai
23.5% 9.0% 14.5% 18.5% 9.5% 33.0% 6.8% 16.7% 7.7% 26.2%
Considering that rai is near the end of chromosome III, construct a map of these genes. Drag gene names to blue targets and map distances to pink targets.
a. 6.8
b. 7.7
c. 9.0
d. 9.5
1. cu
2. eyg
3. h
4. th
1. The genes for miniature wings (m) and garnet eyes (g) are approximately 8 map units apart on chromosome 1 in Drosophila. Phenotypically wild-type females (m+g / mg+) were mated to miniature-winged males with garnet eyes (mg / mg). Which of the following phenotypic classes reflect offspring that were generated as a result of a crossover event?
a. miniature wings,
b. wild-type eyesminiature wings,
c. garnet eyeswild-type wings,
d. garnet eyeswild-type wings,
e. wild-type eyes
2. If 800 offspring were produced from the cross, in what numbers would you expect the following phenotypes?
a. wild-type wings, wild-type eyes :_____.
b. miniature wings, wild-type eyes :_____.
c. wild-type wings, garnet eyes :_____.
d. miniature wings, garnet eyes:_____.
