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 what arrangement of genes?
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:
| 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 between 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.
Morgan's crosses of red-eyed and white-eyed Drosophila
Phenotypic effects in Drosophila larvae that have mutations in segmentation genes
Female gametophyte within an ovule
Female tick with eggs
Polytene chromosomes derived from larval salivary gland cells of Drosophila