Exam 3 Polling Questions Flashcards
A population of Dodos has both a red and black morph. This color morph is controlled by a single locus, where the red allele (R) is dominant to the black allele (B). In an initial generation in this population, there are 40 Dodos homozygous for the red allele, 48 Dodos that are heterozygotes, and 12 Dodos homozygous for the black allele. What is the allele frequency of the red allele?
A: 0.12
B: 0.36
C: 0.64
D: 0.88
E: 0.5
C
A population of Dodos has both red and black morphs. This color morph is controlled by a single locus, where the red allele is dominant to the black allele. In an initial generation in this population, there are 64 red Dodos and 36 black Dodos. What is the allele frequency of the red allele if this population is in HWE?
A: 0.2
B: 0.4
C: 0.6
D: 0.8
E: Not listed
B
A population of Dodos has both red and black morphs. This color morph is controlled by a single locus, where the red allele is dominant to the black allele. In an initial generation in this population, there are 64 red Dodos and 36 black Dodos. If this locus conforms to HWE, and there are 200 individuals in the next generation, how many Dodos have both a red and a black allele?
A: 0 Dodos
B: 24 Dodos
C: 72 Dodos
D: 96 Dodos
E: 128 Dodos
D
A population of Dodos has both red and black morphs. This color morph is controlled by a single locus, where the red allele is dominant to the black allele. In an initial generation in this population, there are 64 red Dodos and 36 black Dodos. If this locus conforms to HWE and there are 200 individuals in the next generation, how many red and black Dodos are there in the next generation?
A: 128 red, 72 black
B: 108 red, 92 black
C: 144 red, 56 black
D: 56 red, 144 black
E: trick question, everyone knows that young Dodos are always green
A
After many generations of similar selection, what would you expect the allele frequencies to be in this population:
A1A1 allele –> 4 juveniles, only 2 survive to adulthood, produce 4 offspring
A1A2 allele –> 8 juveniles, only 6 survive to adulthood, produce 8 offspring
A2A2 allele –> 4 juveniles, all survive adulthood, produce 5 offspring
A: the population will be fixed for the A1 allele
B: the population will be fixed for the A2 allele
C: the population should maintain both alleles at some frequency
B
Which allele is most likely to go to fixation first?
A: Favored allele with a starting allele frequency of 0.3 that exhibits incomplete dominance
B: Favored allele with a starting allele frequency of 0.1 that exhibits incomplete dominance
C: Favored allele with a starting allele frequency of 0.1 is the dominant allele
D: Favored allele with a starting allele frequency of 0.3 that is the dominant allele
E: Non-favored allele with starting allele frequency 0.4 that exhibits incomplete dominance
A
A regression of offspring tail length against mid-parent tail length in opossums has a slope of 0.72. What does this indicate about the heritability of tail length?
A: 72% of the variation in offspring tail length can be explained by the tail length of the parents
B: 72% of the variation in offspring tail length can be explained by environmental variation
C: The narrow-sense heritability of tail length is 0.28
D: The more individuals in the population, the more heritability will decline
E: Nothing can be determined about the heritability of tail length from this data
A
At the bob locus there are two alleles, m and n. The initial allele frequency of the m allele is 0.7. Fixation of which allele is more likely? After three generations, the allele frequency of the m allele is now 0.49. Fixation of which allele is now more likely?
A: m, m
B: n, n
C: n, m
D: m, n
E: Fixation will never happen
D
A rancher determines that the average amount of wool produced by a sheep in her flock is 22 kg per year. To increase the wool production of her flock, she picks 5 male and 5 female sheep with the greatest wool production; the average amount of wool produced per sheep by those 10 is 30 kg. If the narrow sense heritability of wool yield is 0.5, what should the average production of wool in the next generation be?
A: 4 kg
B: 8 kg
C: 26 kg
D: 30 kg
C
A rancher determines that the average amount of wool produced by a sheep in her flock is 22 kg per year. To increase the wool production of her flock, she picks 5 male and 5 female sheep with the greatest wool production; the average amount of wool produced per sheep by those 10 is 30 kg. She interbreeds these selected sheep and finds that the average wool production among the progeny of the selected sheep is 28 kg. What is the narrow-sense heritability for wool production among the sheep in her flock?
A: 0.25
B: 0.5
C: 0.75
D: This is not a heritable trait
C
Which of the following types of selection ALWAYS leads to an increase in trait variation within a population?
A: Directional selection
B: Stabilizing Selection
C: Diversifying selection
D: Positive frequency dependent selection
C
The allele frequency for the B1 allele at the B locus in Avena fatua (wild oats) is 0.6. If the frequency of the B1B2 genotype is 0.07, what is f?
A: 0.4
B: 0.71
C: 0.85
D: -0.71
E: -0.85
Does this population actively inbreed or avoid inbreeding?
C; avoid inbreeding
Populations that have increased gene flow between them should be ___ differentiated and have a ___ Fst.
A: less, lower
B: less higher
C: more, lower
D: more higher
A
Which mode of speciation has the lease gene flow between morphs occurring during the speciation process?
A: Vicariance speciation
B: Peripatric speciation
C: Parapatric speciation
D: Sympatric speciation
D
Which mode of speciation would the lowest genome-wide divergence between the incipient species?
A: Vicariance speciation
B: Peripatric speciation
C: Parapatric speciation
D: Sympatric speciation through a “magic trait”
D
