BIOL 3301 Genetics Final Exam
All questions are weighted equally and are worth 2 points each
Multiple Choice
1. Between 1976 and 1983, Argentina was governed by a repressive military dictatorship. A
particular aspect of the terror involved kidnapping pregnant women and taking them to
secret detention centers where they were held until they had their babies. After giving
birth, the mothers were killed and the babies were given to families that wanted children
and that had close ties to the government. Political pressures removed the military
government from power in 1983 and the newly elected president established a
commission to investigate the fates of the disappeared. Mitochondrial DNA analysis was
used on the kidnapped babies and their
a) Maternal grandfather
b) Maternal grandmother
c) Paternal grandfather
d) Paternal grandmother
2. You are given a human pedigree for a genetic disorder. You notice that none of the
females are afflicted by the disorder whereas around 50% of the males are afflicted. What
is the most likely mode of inheritance?
a) Autosomal dominant
b) Autosomal recessive
c) X-linked recessive
d) X-linked dominant
e) Y-linked dominant
3. You perform a dihybrid cross between two plants with purple flowers and yellow seeds
(WwGg). What is the probability that a randomly sampled offspring is homozygous for
both recessive alleles, given that it has purple flowers and yellow seeds?
a) 0
b) 1
c) ¼
d) 1/9
e) 1/16
4. A gene controlling fruit size in a tomato has two alleles L and S. You cross a large LL
homozygote with a small SS homozygote and observe all medium fruit size in the F1
offspring. When you cross the F1 heterozygotes, what phenotypic ratio do you expect in
the F2 progeny?
a) 1:1 big:small
b) 3:1 big:small
c) 3:1 big:medium
d) 1:1:1 big:medium:small
e) 1:2:1 big:medium:small
