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.
Formation of additional eyes in Drosophila caused by the abnormal expression of a master control gen
Female cheetah and cubs in the Ngorongoro Conservation Area
Female Breast Lymphatic Drainage
Human chromosomes. (A) Female. (B) Male.
The effect of disruptive selection on bristle number in Drosophila