There are a total of 13 pages in this exam. This exam consists of 36 questions
worth a total of 100 points. All questions are multiple choice and there is one best
answer for each question. Record your answers on the scantron sheet, and answer
only once for each question or you will be automatically marked wrong. Use a #2
pencil.
Name
ID#
1
, 1. You cross a true-breeding pea plant with long, purple seeds to a true breeding pea plant
with round, red seeds. All the F1 progeny have long, purple seeds. When you test cross the
F1 progeny, you observe the following phenotypic ratios in the F2 generation:
Phenotype Count
long, purple 150
round, purple 50
long, red 50
round, red 150
Total: 400
What is the genetic distance between the seed color and seed shape genes?
A. 20 cM
B. 25 cM
C. 33 cM
D. 50 cM
E. 150 cM
2. You are consulting for a TV show that attempts to match adopted children with their birth
parents. The TV producers have determined the allele of a mitochondrial gene carried by a
boy, a girl, five potential fathers, and five potential mothers. What relationships will they be
able to establish?
A. They can determine the mother and father of the boy, but they cannot determine
the parents of the girl.
B. They can determine the mother and father of the girl, but they cannot determine
the parents of the boy.
C. They can determine the mother of the boy and girl, but they cannot determine the
father of the kids.
D. They can determine the father of the boy and girl, but they cannot determine
the mother of the kids.
E. They can only determine the relationships between mothers and daughters.
3. There are three alleles for a gene: A1, A2, A3. Allele A1 is dominant to A2 and A3. Allele A2 is
dominant to A3. Each allele causes a different phenotype. If you cross an A1A2 heterozygote
with an A2A3 heterozygote, what phenotypic ratio do you expect in the progeny?
A. 1:1:1:1
B. 1:1
C. 3:1
D. 2:1
E. All individuals have the same phenotype.
2
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