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salmonpanda825Lv1

28 Sep 2019

You fished 100 drosophila out of your cup of tea this morning! There were 20 white, 70 red, and 10 orange eyed flies. This eye-color trait is controlled by a single locus, with 2 alleles. The red color allele is co-dominant, such that the individuals with orange colored eyes are heterozygotes.

a)What is the frequency of the red eye color allele?
b)What is the expected frequency of orange-eyed flies under Hardy-Weinberg equilibrium?
c)Is this population in Hardy-Weinberg equilibrium?
d) What is a plausible explanation of your result?

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28 Sep 2019

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Related questions

Please do not answer unless you are planning on answering all parts of the question. Thank you very much. I really appreciate it.

9. (8 pts) In a population of 500 fruit flies living in an isolated windowless store room of the kitchen of the Inn @ Lowell, eye colour is determined at a single locus with two alleles. RR and Rr result in red eyes; rr in white eyes. These flies mate assortatively according to eye color (red-eyed flies prefer red-eyed flies and white-eyed flies prefer white-eyed flies). I find the following genotype numbers:

RR Rr rr

400 20 80

a. What are the frequencies of the R and r alleles in the population?

b. A catastrophic power failure at the Inn @ Lowell plunges the store room into total darkness. The flies can no longer select their mates on the basis of eye color (because they canât see them). They therefore mate at random. What are the genotype frequencies in the next generation?

c. What are the expected phenotype frequencies after the power cut?

d. Assuming that the electricians at the Inn @ Lowell cannot figure out the cause of the problem, and the storeroom remains dark for years to come after the initial power cut, what will be the frequencies of the fruit fly eye color genotypes 5 generations after the power cut?

14A. Suppose a population of flour beetles has 10,000 individuals. There are two alleles possible for the gene that determines body color: red (B), and black (b). BB and Bb beetles are red, while bb individuals are black. Assume the population is at HardyâWeinberg equilibrium, with equal frequencies of the two alleles.

What would be the expected frequency of red beetles?

14B. What would be the expected frequency of black beetles in the population as described in A?

14C. Assuming that Hardy-Weinberg equilibrium remains in effect, what would be the expected frequencies of BB, Bb, and bb individuals after 100 generations?

BB = 0.5, bb = 0.5

Bb = 0.75 bb = 0.25

BB = 0.75 bb = 0.25

BB = 0.25, Bb = 0.5, bb = 0.25

The answer cannot be determined.

14D. What would be the expected red (B) allele frequency if 10,000 black individuals migrated into the population?

14E. What would be the expected black (b) allele frequency after the migration described in part D?

14F. Violation of what two Hardy-Weinberg assumptions could return the population to the original allele frequencies (described in A)? Briefly explain how each violation would return the population to the original allele frequencies in 1-2 sentences (each).

sapphireshark676

Q5. A sunflower population in Hardy-Weinberg equilibrium has the following allele frequencies for petal color: 0.75 dominant, 0.25 recessive. If the assumptions of Hardy-Weinberg equilibrium continue to hold, then after 200 generations:

The allele frequencies will be: 0.75 dominant and 0.25 recessive.

The allele frequencies will be: 0.50 dominant and 0.50 recessive.

The allele frequencies will be: 1.0 dominant and 0 recessive. T

here is no way to predict allele frequencies, given the information provided.

Q6. Mead and his colleagues proposed a hypothesis for the apparent heterozygote advantage for the PrP locus. What did they suggest as the basis for the high presence of both alleles?

History of cannibalism.

Protection from malaria.

Protection against plague.

They did not propose a heterozygotic advantage for the PrP locus.

Q7. A frog population has two alleles for skin color at the following relative frequencies: Allele SC1= 0.8, Allele SC2 = 0.2. Allele SC2 is:

Dominant

Recessive

Co-dominant

Impossible to determine dominance from the information given.

Q8. A bird population has two alleles for feather color at the following relative frequencies: Allele FC1 = 0.5, Allele FC2 = 0.5. Allele FC1 is:

Dominant

Recessive

Co-dominant

Impossible to determine dominance from the information given.

Q9. Use the following information for both questions 9 and 10: You encounter a few populations of millipedes with variation in skin color. Genotype can be inferred from coloration: CC millipedes are black, Cc millipedes are brown, and cc millipedes are yellow. [You can launch a calculator byclicking here.] If one millipede population has 60 black individuals, 20 brown individuals, and 20 yellow individuals, what is the relative frequency of allele C in that population?

0.5

0.6

0.7

0.8

Impossible to calculate from the information given.

Q10. If another millipede population's allele frequencies are 0.5 for C and 0.5 for c, what is the expected frequency of the cc genotype in the population, if the population is in Hardy-Weinberg equilibrium?

0.125

0.25

0.5

1.0

Impossible to calculate from the information given.