Biology 1108 Exam 3/ University Of Connecticut BIOL 1108 Exam 3 (answered) Spring 2022/2023
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Course
BIOL 1108 (BIOLOGY1108)
Institution
School Of Nursing - University Of Connecticut
Book
Biology 2e
Biology 1108 Exam 3
1. An important result from the monohybrid cross experiments was that phenotypes appeared in
predictable ratios, indicating that only one copy of each gene passes from a parent to its offspring.
This is now referred to as:
a. Sympatric speciation
b. The Hardy-Weinberg Equil...
an important result from the monohybrid cross experiments was that phenotypes appeared in predictable ratios
indicating that only one co
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Biology 1108 Exam 3
1. An important result from the monohybrid cross experiments was that phenotypes appeared in
predictable ratios, indicating that only one copy of each gene passes from a parent to its offspring.
This is now referred to as:
a. Sympatric speciation
b. The Hardy-Weinberg Equilibrium
c. The Law of Independent Assortment
d. The Law of Segregation
e. The Theory of Natural Selection
2. In Mendel's crosses, he found that it was possible to recover traits that were present in grandparents
but had disappeared in parents. This was important evidence that:
a. categorical traits are not genetic
b. dominance can be incomplete
c. inheritance is particulate
d. quantitative traits have blending inheritance
e. there is inheritance of acquired characteristics
3. In tigers, a recessive allele causes a white tiger (absence of fur pigmentation). If one phenotypically
normal tiger that is heterozygous is mated to another that is phenotypically white, what percentage of
their offspring is expected to be white?
a. 0%
b. 25%
c. 50%
d. 75%
e. 100%
4. A man has extra digits (six fingers on each hand and six toes on each foot). His wife and their
daughter have a normal number of digits. Having extra digits is a dominant trait. The couple's second
child has extra digits. What is the probability that their next (third) child will have extra digits?
a. 1/2
b. 1/8
c. 1/16
d. 3/4
e. 9/16
5. Suppose two AaBbCc individuals are mated. Assuming that the genes are not linked, what fraction
of the offspring are expected to be homozygous recessive for the three traits?
a. 1/256
b. 1/64
c. 1/4
d. 1/8
e. 1/16
This study source was downloaded by 100000840858457 from CourseHero.com on 02-24-2022 15:03:58 GMT -06:00
, 6. In the F2 generation of the monohybrid cross, it is possible to get 3 phenotypes. What is this
evidence for and what is the ratio of the phenotypes?
a. Complete dominance, 1:1:1 ratio
b. Genetic drift, 1:1:1 ratio
c. Incomplete dominance, 1:2:1 ratio
d. Blending inheritance, 1:2:1 ratio
e. Gene flow, 1:2:1 ratio
7. Mendel performed a dihybrid cross and got recombinant as well as P generation phenotypes in the
F2 generation. This was evidence for:
a. Dependent assortment
b. Independent assortment
c. Mutation
d. Natural selection
e. Plagiarism
8. Snapdragons are flowers that come in a variety of colors, including red, pink, and white. Whenever
the dominant allele of either (or both) gene A or gene B is present, red color is produced. A cross of
AaBb × AaBb can be expected to yield how many red offspring out of 16? Assume the genes are not
linked.
a. 1
b. 4
c. 12
d. 15
e. 16
9. A heterozygous, but phenotypically wild-type fruit fly (gray body color and normal wings) was
mated to a black fly with vestigial wings. The offspring had the following phenotypic distribution:
wild type, 720; black-vestigial, 780; black-normal, 280; gray-vestigial, 220. What conclusion do you
draw from these results?
a. Epistasis has modified a 9:3:3:1 ratio.
b. The black and vestigial loci are allelic.
c. The black and vestigial loci are linked.
d. The black and vestigial loci assort independently from each other.
10. A strain of mice comes in brown, black and white coat colors. White mice crossed with white mice
always make white mice, but any other cross can make litters with all three colors. Further genetic
work reveals that two loci are involved. This is a case of:
a. blending inheritance
b. codominance
c. epistasis
d. incomplete dominance
e. mutation
11. Assume that you know there are two alleles at a locus; one is dominant and the other recessive. If
you know genotype frequencies in a population, in order to predict allele frequencies that will
determine the makeup of the next generation you must also assume
a. A small population
b. Hardy-Weinberg equilibrium
c. Intense natural selection
This study source was downloaded by 100000840858457 from CourseHero.com on 02-24-2022 15:03:58 GMT -06:00
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