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.
Female scorpion Compsobuthus werneri carrying its young (white)
The Female Reproductive System (1 of 2)
Female Reproductive System "الجهاز التناسلي للأنثى"
Comparison of Female and Male Pelvis
Genetic polymorphism for foraging behavior in fruit fly larvae