Question 1
Assume that a cross is made between
AaBb and
aabb plants and that the offspring occur in the following numbers: 106
AaBb, 48
Aabb, 52
aaBb, 94
aabb. These results are consistent with which arrangement of alleles?
Question 2
In the fruit fly,
Drosophila melanogaster, a spineless (no wing bristles) female fly is mated to a male that is claret (dark eyes) and hairless (no thoracic bristles). Phenotypically wild-type F
1 female progeny were mated to fully homozygous (mutant) males, and the following progeny (1000 total) were observed:
| Phenotypes | Number Observed |
| hairless, claret, spineless | 32 |
(a) Which gene is in the middle?
(b) With respect to the three genes mentioned in the problem, what are the genotypes of the homozygous parents used in making the phenotypically wild-type F
1 heterozygote?
(c) What are the map distances for the three genes? A correct formula with the values "plugged in" for each distance will be sufficient.
(d) What is the coefficient of coincidence? A correct formula with the values "plugged in" will be sufficient.
Overview of segmentation in Drosophila
external structure of female reproductive system
Blolo Bla (Female Spirit Spouse)
Female Reproductive System (Illustrated)
Phylogenetic relationships among Hawaiian Drosophila species
X-linked eye-color phenotypes in Drosophila melanogaster