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Look at the following population data for a particularpopulation of Eastern Gray Squirrels (Sciurus carolinensis). Thereis a rare recessive allele that causes the squirrels to be snowwhite instead of the usual gray color.

White Squirrels 198

Gray Squirrels 2002

Assuming the population is in Hardy-Weinberg equilibrium, whatis the allele frequency of the white allele?

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Jean Keeling
Jean KeelingLv2
28 Sep 2019

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The following 3 questions are linked^^^^^^^^^^^^^^^^^

Whip-poor-wills. (Camprimulgus vociferus! Thepopulation has found in two adult phenotypes: rufous(red) and gray.An ornithologist investigates the genetics of this color variationand discovers that rufous individuals are one of two genotypes (RRor Rr), while gray individuals are rr. The frequency of thesegenotypes at Generation 1 in northern New Jersey are: 60% RR,20%Rr, and 20% rr.

1. If the Hardy-Weinberg Law holds for these genetic variants,what is the frequency of the R allele in this population?

(A) 0.3

(B) 0.4

(C) 0.5

(D) 0.6

(E) 0.7

2. What will the phenotype frequency be in the next generation(Generation+1)?

(A) 60% rufous, 40% gray

(B) 80% rufous, 20% gray

(C) 51% rufous, 49% gray

(D) 91% rufous, 9% gray

(E) 49% rufous, 51% gray

3 What will the dominant allele frequency be in the generationafter Generationt+2 ?

(A) 0.3

(B) 0.4

(C) 0.5

(D) 0.6

(E) 0.7

1 A) Cystic Fibrosis is an autosomal recessive disease, 1 out of every 2500 individuals of Caucasian descent in the US have cystic fibrosis. What frequency of cystic fibrosis carriers would you expect in the Caucasian population of the US under Hardy Weinberg Equilibrium? Show your work. (1 pt)

1 B) You know that penguin tuxedo color is a classic Mendelian single-gene trait, the allele for black and white tux coloring (T) is dominant over gray and white tux coloring (t). In a population of penguins, there are 400 black and white tuxedoed penguins and 200 gray and white tuxedoed penguins.

(i) Which observed genotypic or allelic frequencies can be calculated from this scenario without assuming Hardy Weinberg Equilibrium? (1.5 pt)

(ii) In one to two sentences, explain why differences may arise between observed and expected genotype frequencies. (1 pt)

1 C) You are studying inheritance of external keratin features in a dinosaur. Analysis has found that the presence of feathers is due to codominance between the AS (scales) and AH (horns) alleles. In one generation of a population you find 78 scaled dinosaurs, 76 feathered dinosaurs, and 64 horned dinosaurs.

(i) What are the observed allele frequencies of AS and AH ? Use p for the frequency of AS and q for the frequency of AH . Show your work. (1.5 pt)

(ii) What are the observed genotypic frequencies? Show your work. (1 pt)

(iii) Given the allelic frequencies calculated above, what are the expected number of scaled, feathered, and horned dinosaurs in a population of the same size (218) under Hardy Weinberg Equilibrium? Show your work. (1.5 pt)

(iv) Use a chi-square test to examine whether the gene you are studying is under Hardy Weinberg Equilibrium in this population. Show your work. Do you accept or reject the null hypothesis? (2 pts)

Yellow coat color in house mice is produced by the recessive gene c, while the wild type, gray coat color is produced by the dominant gene c+. In a certain population, these are the only two alleles present, with c at a frequency of 0.6. The population is initially at Hardy-Weinberg equilibrium, but then selection is imposed due to predation. In one generation, c changes to 0.56. What is s (selection coeffiecient) during this one generation? (Apply the model for selection against a recessive allele).

The correct answer is 0.25, I just need the math.

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