EXOS PRACTICE TEST QUESTIONS
WITH CORRECT ANSWERS!!
What were Darwin's two main insights about evolution?
(select two answers)
All life has a common ancestor and Evolution proceeds through the mechanism of natural
selection
Evolution via natural selection is a random process:
False
You observe that the frequency of an advantageous allele decreases from one generation
to the next by 20%. which of the following is the most likely explanation?
Natural selection is driving the advantageous allele to fixation in a small population
All new mutations within populations of diploid individuals start at a relative frequency of:
1/(2N_e)
natural selection and genetic drift cannot work simultaneously within populations
False
If I take a set of different genotypes and examine how these genotypes determine
phenotypes in different environments and make a graph if the lines describing trends the i
am examining a : [ Hint: pick the best answer that describes everything in this prompt].
Norm of Reaction
Darwin's mechanism of evolution was heavily influenced by which concept from geology?
Uniformitarianism
You know that the narrow-sense heritability of milk production in Ayrshire cattle is 0.587 .
You perform an experiment where you take a parental population of cattle with a mean
, milk production of 5.1L/hr and selectively breed only the top 10% of cows in this
population, who have a mean milk production of 8.9 L/hr, what is the response to
selection (R) in your experiment?
2.23
The change in allele frequencies from one generation to the next due to random chance is
known as:
genetic drift
Genetic Drift changes allele frequencies more so in larger populations relative to smaller
populations:
false
The genetic code , defines as the set of codons that specify amino acids to be added to
polypeptide chains (= protiens), is degenerate (= redundant)
True
The case where an allele is beneficial (= positive effect on fitness) in some context
but deleterious ((= negative effect on fitness) in others is known by what term?
Antagonistic pleiotropy
If the selection coefficient (s) against recessive homozygotes is 0.5, the fitness of recessive
homozygotes is .80.
false
the Probablity of new mutatuion being fixed in a population by genetic drift is equal to
its frequency
True
Which of the following processes reduces (or eliminates) linkage disequilibrium?
Recombination, spefifically crossing-over during recombination
WITH CORRECT ANSWERS!!
What were Darwin's two main insights about evolution?
(select two answers)
All life has a common ancestor and Evolution proceeds through the mechanism of natural
selection
Evolution via natural selection is a random process:
False
You observe that the frequency of an advantageous allele decreases from one generation
to the next by 20%. which of the following is the most likely explanation?
Natural selection is driving the advantageous allele to fixation in a small population
All new mutations within populations of diploid individuals start at a relative frequency of:
1/(2N_e)
natural selection and genetic drift cannot work simultaneously within populations
False
If I take a set of different genotypes and examine how these genotypes determine
phenotypes in different environments and make a graph if the lines describing trends the i
am examining a : [ Hint: pick the best answer that describes everything in this prompt].
Norm of Reaction
Darwin's mechanism of evolution was heavily influenced by which concept from geology?
Uniformitarianism
You know that the narrow-sense heritability of milk production in Ayrshire cattle is 0.587 .
You perform an experiment where you take a parental population of cattle with a mean
, milk production of 5.1L/hr and selectively breed only the top 10% of cows in this
population, who have a mean milk production of 8.9 L/hr, what is the response to
selection (R) in your experiment?
2.23
The change in allele frequencies from one generation to the next due to random chance is
known as:
genetic drift
Genetic Drift changes allele frequencies more so in larger populations relative to smaller
populations:
false
The genetic code , defines as the set of codons that specify amino acids to be added to
polypeptide chains (= protiens), is degenerate (= redundant)
True
The case where an allele is beneficial (= positive effect on fitness) in some context
but deleterious ((= negative effect on fitness) in others is known by what term?
Antagonistic pleiotropy
If the selection coefficient (s) against recessive homozygotes is 0.5, the fitness of recessive
homozygotes is .80.
false
the Probablity of new mutatuion being fixed in a population by genetic drift is equal to
its frequency
True
Which of the following processes reduces (or eliminates) linkage disequilibrium?
Recombination, spefifically crossing-over during recombination
