Question 3 (8 points)
Brown fur stripes (autosomal recessive) is found in 13% of thesquirrels in Yellowstone National Park. Black is the dominantstripe color. Answer the following questions about this population,assuming this population of squirrels is in Hardy-Weinbergequilibrium with respect to fur stripes.
What are the frequencies of the brown stripe (b) and blackstripe (B) alleles?
â¨b) What is thefrequency of heterozygotes?
â¨c) In the nextgeneration, what is the proportion of heterozygote matings?(Hint: You will need to use the product rule.)
d) In the next generation, what proportion ofsquirrels will be brown stripe progeny resulting from heterozygotematings? (Hint: You will need to use the productrule.)
Question 3 (8 points)
Brown fur stripes (autosomal recessive) is found in 13% of thesquirrels in Yellowstone National Park. Black is the dominantstripe color. Answer the following questions about this population,assuming this population of squirrels is in Hardy-Weinbergequilibrium with respect to fur stripes.
What are the frequencies of the brown stripe (b) and blackstripe (B) alleles?
â¨b) What is thefrequency of heterozygotes?
â¨c) In the nextgeneration, what is the proportion of heterozygote matings?(Hint: You will need to use the product rule.)
d) In the next generation, what proportion ofsquirrels will be brown stripe progeny resulting from heterozygotematings? (Hint: You will need to use the productrule.)
Related textbook solutions
Related questions
Problem B: Prairie Dog Population Genetics
A relatively stable population of Black-footed Prairie Dogs (70,000 individuals) lives in a national park in
Saskatchewan, Canada. These creatures have various tones of brown fur, but may have brown or auburn tails.
Furthermore, tails may be of solid color (brown or auburn) or be tipped with white or black fur. Three alleles for
tail coloration exist in this population. These alleles include:
| Allele | Trait | Notes on Phenotype and Relationship to other Alleles |
| T | White Tip | Tail has white fur at tip. Completely dominant over t; codominant with T* |
| t | Black tip | Tail has black fur at tip. Codominant with T*; recessive to T |
| T* | Auburn tail | Background tail color is auburn when T* is present. Codominant with T or t |
The frequency of the (T) allele in this population is 0.28, and the frequency of the (t) is 0.4.
Answer each of the following. Show all of your work/calculations. Cite your rationale if appropriate.
1. List and describe all the possible genotypes and their respective phenotypes for this gene system in the
population.
2. Using the Hardy-Weinberg theorem, calculate the probable frequency of animals with the following
phenotypes in this population:
⢠White tipped tails
⢠Black tipped auburn tails
3. What is the expected combined frequency of individuals carrying the TT, TT* and Tt genotypes in this
population?
4. How many (number, not percentage) of the prairie dogs would you expect to have black tipped, auburn
tails? Explain.
5. In a different population of 10,000 prairie dogs (South Dakota, USA), only the T and t alleles are found. If
this group included only 400 animals with black tipped, brown tails, what is the probable number (not
frequency) of individuals that are homozygous dominant (TT) in this herd?
1) Which of these probabilities are NOT independent of eachother?
| The probability that a student is a sophomore and has brownhair |
| The probability that when you roll two dice, you will roll a 6before a 2 |
| The probability that it will rain and the probability ofneeding an umbrella |
| The probability that there will be heavy traffic on BaltimoreAve and the probability you will lose your cell phone 2) We are defining evolution as a "change in allele frequenciesover time". Ironically, the focus of this lab is the Hardy-Weinbergequilibrium - conditions that, if all met, will result in NOevolution occurring. Which of the following are among theconditions that must be met for the Hardy-Weinberg equilibrium toapply perfectly to a population?
|
