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Genetic Variation 2
Test Description: HSCA 6
Instructions: Answer all questions to get your test result.
1) A buttefly has 4 offspring. 2 offspring are striped and 2 offspring are spotted. These results indicate these patterns are the result of a
A
dihybrid cross
B
monohybrid cross
C
random mutation
D
natural selection
2) Scientists excavate the skull of an extinct wolf. Based on the evidence, researches determine the extinct wolf diverged from modern wolfs 2 million years ago. What evidence did they use to determine this?
A
Geologic strata.
B
Historical record of wolf interactions with each other.
C
Fossil record and DNA evidence.
D
The diet of the modern wolf compared to the foods found near the extinct wolf's skull.
3) Imagine hair type is controlled by a single allele. Straight hair is recessive to curly hair. In a cross between 2 people with straight hair, what is the chance of them having a child with curly hair?
A
0%
B
25%
C
75%
D
50%
4) An individual has the genotype: yyBb. What percentage of gametes produced by this individual will have the genotype yB?
A
25%
B
0%
C
50%
D
75%
5) Pink flowers result because the alleles for red and white are codominant. When two pink flowers are crossed, what percentage of offspring are red?
A
50%
B
0%
C
75%
D
25%
6) In European deer, implantation of embryos are delayed. Deer mate in August but don't give birth until the following June. The embryo stays dormant from late summer until December. Which best explains why this happens?
A
Delayed implantation is an advantage that allows the mother to re-absorb the embryo if she needs the resources.
B
Delayed implantation is an advantage that allows the female to mate with other males.
C
Delayed implantation is an advantage that allows the fawns to be born in the spring when there is more food than in winter.
D
Delayed implantation is an advantage that allows the females to produce more offspring every year.
7) Humans in Montana have hunted wolves to the point of extinction. What effect could this have on the deer population in that state?
A
Deer will evolve to become predators themselves.
B
Deer will become overpopulated because they have fewer predators to contend with.
C
The deer will be unaffected by this change.
D
Deer will die off due to lack of predation.
8) Organisms can be classified based on homology, or shared characteristics inherited from a common ancestor. Recently, molecular biologists have been able to compare homologies at the genetic level. Why is this possible?
A
All organisms share the same organelles.
B
All organisms make the same proteins.
C
All organisms share the same nucleotides in their DNA.
D
All organisms make the same chromosomes.
9) Two populations of rabbits are separated for some time by a great river. Over time, the river dries and some of rabbits from one population mate with rabbits from the other population. Which of the following is likely to occur?
A
The offspring will be stronger than either of the two populations.
B
The offspring will be genetically identical to one of the two populations.
C
The offspring will die off due to genetic mutations.
D
The offspring will have more genetic variation than offspring from either population?
10) Facial dimples and free ear lobes are traits expressed by dominant alleles. What is the phenotypic outcomes of a cross between a female with a DdFf genotype and a male with a ddff genotype?
A
25% dimples and 50% free earlobes
B
50% dimples and 50% free earlobes
C
50% dimples and 25% free earlobes
D
100% dimples and 50% free earlobes
11) Punctuated equilibrium can be caused by
A
A sudden change in the environment leading to rapid change in individuals
B
A sudden change in environment leading to rapid change in populations
C
A sudden change in the environment leading to mass extinction of populations
D
A sudden change in environment leading to gradual change in populations
12) Dandelions produce seeds that are light weight and blow easily with the wind. Why did the dandelions develop this adaptation?
A
Allows the seeds to look appetizing for consumption.
B
Allows the seeds to stay near the parent for protection.
C
Allows the seeds to catch the wind increasing the chance that they will mutate into flying plants.
D
Allows the seeds to spread easily to limit competition for limited resources.
13) The variation in dog breeds can best be explained by
A
genetic flow
B
artificial selection
C
random mutations
D
natural selection
14) North American possums and Australian kangaroos are both marsupials which allow their immature offspring to develop in an external pouch. How can this similarity best be explained?
A
They are actually the same species.
B
One species copied the other.
C
They both descended from a common ancestor that carried offspring in this manner.
D
They mated with each other.
15) Huntington's disease is a rare, inherited condition that affects people around 50 years of age. The allele for Huntington's is dominant. Which of the following statements is best supported by these facts?
A
A heterozygous parent has a 50% chance of passing the condition onto the offspring.
B
Huntington's disease is a genetic benefit.
C
A homozygous recessive parent has a 100% chance of passing the condition onto offspring.
D
Natural selection will weed out the Huntington's allele.
16) Two remote islands contain 2 different species of palm trees which are similar, but do not interbreed. Which evolutionary process fails to occur?
A
Natural selection of adaptions beneficial for each species on their respective islands.
B
Gene flow between species.
C
Genetic drift of each of the species.
D
Mutations in the 2 species.
17) A species contains 34 chromosomes. How many chromosomes are in the haploid cells?
A
68
B
15
C
17
D
34
18) Which of the following is NOT a mechanism for evolution?
A
Natural selection
B
Genetic equilibrium
C
Genetic drift
D
Mutation
19) What best explains the presence of leg bones in baleen whales?
A
The whales can cause themselves to mutate if they get close to land.
B
The whales descended from a legged ancestor.
C
The whales are evolving legs to gain access to land.
D
The whales carry a mutation that causes them to sprout legs.
20) What percentage of offspring in a dihybrid cross of DdFf and ddff are expected to be heterozygous for both traits?
A
50%
B
25%
C
0%
D
75%
*select an answer for all questions
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