BIOL-1033 Exam #4 Questions With Complete Solutions
A gene pool is Correct Answers all the genes in a population
A group of individuals that can interbreed in nature and produce
viable offspring would be considered to be a species according
to the ____________________ concept Correct Answers
biological species
A horse has 64 chromosomes and a donkey has 62
chromosomes. A cross between a female horse and a male
donkey produces a mule, which is sterile. What type of post-
zygotic reproductive isolating mechanism prevents mules from
becoming a species? Correct Answers Hybrid sterility
A man and a woman are both heterozygous carriers for the
recessive allele that causes cystic fibrosis. What is the
probability that they will have an offspring who has cystic
fibrosis? Correct Answers 25%
A population of mice with light tan color fur live in a shady
forest. Then a mutation results in some mice with a dark brown
coloration. The darker mice are harder for predators to see in the
leaf litter, thus they are less likely to be eaten. After 10
generations, the majority of mice in the population are dark
brown. In the figure above, the solid line represents the number
of light colored individuals before the mutation and the dashed
line represents the number of dark brown individuals after 10
generations. What type of natural selection are the population of
mice going through? Correct Answers Directional selection
, All the offspring of a cross between a red-flowered plant and a
white flowered plant have pink flowers. This means that the
allele for red flowers is _______ to the allele for white flowers.
Correct Answers incompletely dominant
Alternate molecular forms of a gene are Correct Answers
Alleles
An X-linked gene is Correct Answers a gene on the X
chromosome
Changes in allele frequencies due to random chance Correct
Answers Genetic drift
During the Beagle journey, Darwin visited islands, allowing him
to compare island species with continental species. In terms of
framing his theory of evolution, why was this significant?
Correct Answers Because the island species had both
similarities to their continental ancestors and unique adaptations
to their island environments.
During which period did the diversity of animal species
increased Correct Answers Cambrian
Evolution can be observed in Correct Answers Population
Fitness is a measure of reproductive success. If an individual
with genotype BB produces 6 offspring, and a heterozygous
individual (Bb) produces 10 offspring, and a third individual
with genotype bb produces 5 offspring, what is the fitness value
for the individual with BB genotype? Correct Answers 0.6
A gene pool is Correct Answers all the genes in a population
A group of individuals that can interbreed in nature and produce
viable offspring would be considered to be a species according
to the ____________________ concept Correct Answers
biological species
A horse has 64 chromosomes and a donkey has 62
chromosomes. A cross between a female horse and a male
donkey produces a mule, which is sterile. What type of post-
zygotic reproductive isolating mechanism prevents mules from
becoming a species? Correct Answers Hybrid sterility
A man and a woman are both heterozygous carriers for the
recessive allele that causes cystic fibrosis. What is the
probability that they will have an offspring who has cystic
fibrosis? Correct Answers 25%
A population of mice with light tan color fur live in a shady
forest. Then a mutation results in some mice with a dark brown
coloration. The darker mice are harder for predators to see in the
leaf litter, thus they are less likely to be eaten. After 10
generations, the majority of mice in the population are dark
brown. In the figure above, the solid line represents the number
of light colored individuals before the mutation and the dashed
line represents the number of dark brown individuals after 10
generations. What type of natural selection are the population of
mice going through? Correct Answers Directional selection
, All the offspring of a cross between a red-flowered plant and a
white flowered plant have pink flowers. This means that the
allele for red flowers is _______ to the allele for white flowers.
Correct Answers incompletely dominant
Alternate molecular forms of a gene are Correct Answers
Alleles
An X-linked gene is Correct Answers a gene on the X
chromosome
Changes in allele frequencies due to random chance Correct
Answers Genetic drift
During the Beagle journey, Darwin visited islands, allowing him
to compare island species with continental species. In terms of
framing his theory of evolution, why was this significant?
Correct Answers Because the island species had both
similarities to their continental ancestors and unique adaptations
to their island environments.
During which period did the diversity of animal species
increased Correct Answers Cambrian
Evolution can be observed in Correct Answers Population
Fitness is a measure of reproductive success. If an individual
with genotype BB produces 6 offspring, and a heterozygous
individual (Bb) produces 10 offspring, and a third individual
with genotype bb produces 5 offspring, what is the fitness value
for the individual with BB genotype? Correct Answers 0.6
