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13 Apr 2019

A trait in a hummingbird population is the presence or absence of a white spot on the belly of the hummingbirds, which is controlled by a single gene with two alleles such that WW individuals have a spot, NN individuals do not have a spot, and W is dominant to N so WN individuals have a spot and look just like WW individuals for this trait. Presence or absence of the white spot has no impact on survival or reproduction; individuals mate at random with regard to whether or not there is a spot. 3/4 of the individuals in the population have a white spot. What is the frequency of the N allele?

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Deanna HettingerLv2

13 Apr 2019

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Related questions

Part A

In humans, individuals may or may not have a widowâs peak. This trait is controlled by genes at a single locus, with the allele for having a widowâs peak dominant to the allele for not having one. A population of humans is sampled; 59 have a widowâs peak and 44 do not. 25 of the people with a widowâs peak are homozygous dominant. What are the frequencies of the dominant and recessive alleles observed in this sample?

p = _____

q = _____

Part B

In a species of corn, individuals have either narrow or wide corn cobs. This trait is controlled by genes at a single locus, with the narrow cob allele dominant to the wide cob allele. A farmer counts 74 narrow cob and 113 wide cob plants in a field. Of the narrow cob plants, 28 are homozygous dominant. What are the frequencies of the dominant and recessive alleles observed in this sample?

p = _____

q = _____

Part C

In a population of peas, the frequency of the dominant allele for a purple flower is 0.61 and the frequency of the recessive allele for a white flower is 0.39. What would the genotypic frequencies be if the population is in equilibrium?

_____ = Frequency of homozygous dominant individuals

_____ = Frequency of heterozygous individuals

_____ = Frequency of homozygous recessive individuals

How many individuals would you expect of each genotype in a population of 500 peas?

_____ = Number of homozygous dominant individuals

_____ = Number of heterozygous individuals

_____ = Number of homozygous recessive individuals

Part D

In mice, a mahogany coat color allele is dominant over the tan coat color allele. In a population of mice, the frequency of the allele for mahogany coat color is 0.19 and the frequency of the allele for tan coat color is 0.81. What would the genotypic frequencies be if the population is in equilibrium?

_____ = Frequency of homozygous dominant individuals

_____ = Frequency of heterozygous individuals

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How many individuals would you expect of each genotype in a population of 100 mice?

_____ = Number of homozygous dominant individuals

_____ = Number of heterozygous individuals

_____ = Number of homozygous recessive individuals

Part E

In humans, the free earlobe allele is dominant over the attached ear lobe allele. In a population of humans, the frequency of the allele for free earlobes is 0.42 and the frequency of the allele for attached earlobes is 0.58. What would the genotypic frequencies be if the population is in equilibrium?

_____ = Frequency of homozygous dominant individuals

_____ = Frequency of heterozygous individuals

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How many individuals would you expect of each genotype in a population of 25 humans?

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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
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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
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â¢ White tipped tails
â¢ 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?

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