Ask Biology Expert

1. Let's say you have a trait (a phenotype) that is controlled by 1 gene (coat color) and 2 alleles (blue coat allele and red coat allele). The alleles are codominant, so a heterozygote is green. In a population of animals you see 100 red coat individuals, 100 blue coat individuals, and 50 green coat individuals.

a. What are the phenotype frequencies in this population?

b. What are the observed genotype frequencies in this population?

c. What are the allele frequencies in a gene pool for this population?

d. What genotype frequencies would you expect if this population were not evolving?

2. Several genes control wing shape in Drosophila melanogaster. One of wing shape phenotypes is normal / curly winged phenotype. This is a 1 gene / 2 allele gene system in which the normal wing allele is dominant over the curly wing allele. You have found a population of D. melanogaster living in the sub-basement of Combs Hall on campus. Combs Hall was the sciences building until 1998. You have found that 5% of the population has curly wings and 95% of the population has normal size wings.

a. What are the types of phenotypes in this population.

b. What are the possible genotypes of the 2 phenotypes.

c. What are the phenotype frequencies?

d. What are the observed genotype frequencies?

e. If you assume this population is a large, random mating population that is not undergoing evolution, what are the genotype frequencies? First, figure the allele frequencies in the gene pool.

3. You have sampled a population in which you know that the percentage of the homozygous recessive genotype (aa) is 36%. Using that 36%, calculate the following:

a. The frequency of the "aa" genotype.

b. The frequency of the "a" allele.

c. The frequency of the "A" allele.

d. The frequencies of the genotypes "AA" and "Aa."

e. The frequencies of the two possible phenotypes if "A" is completely dominant over "a."


4. Sickle-cell anemia is a globally important disease and it has interesting genetics. Normal homozygous individials (SS) have normal red blood cells AND these normal red blood cells are easily infected with the malarial parasite. Thus, many of these individuals become very ill from the parasite and many die. Individuals homozygous for the sickle-cell trait (ss) have red blood cells that readily collapse when deoxygenated (i.e. sickle-cells). Although malaria cannot grow in these red blood cells, individuals often die because of the misshapen cells. However, individuals with the heterozygous condition (Ss) have some sickling of red blood cells, but generally not enough to cause mortality. In addition, malarial parasites cannot survive well within these "partially defective" red blood cells. Thus, heterozygotes tend to survive better than either of the homozygous conditions. If 9% of an African population is born with a severe form of sickle-cell anemia (ss), what percentage of the population will be more resistant to malaria because they are heterozygous (Ss) for the sickle-cell gene? Assume the population starts in Hardy-Weinberg equilibrium.

a. What are the phenotype frequencies in this population?

b. What are the observed genotype frequencies in this population?

c. What are the allele frequencies in a gene pool for this population?

d. Would you expect this population to remain in Hardy-Weinberg equilibrium (not evolve)? (Be sure to say No!) Why do you say that?

Biology, Academics

  • Category:- Biology
  • Reference No.:- M9368083

Have any Question?


Related Questions in Biology

Case study question -case study - mary 21 years old

Case Study Question - Case Study - Mary, 21 years old, presented to the hospital emergency department with an infected laceration on her left foot. Mary was at a beach resort four days ago, when she trod on a broken glas ...

Assignment -the upper-case blue letters are the 14th exon

Assignment - The upper-case, blue letters are the 14th exon (of 20) in the Hephl1 gene in mice. The lower-case (black) letters are from the flanking introns.  The highlighted bases indicate primers that may be used to ge ...

Question - a pure strain of mendels peas dominant for all

Question - A pure strain of mendel's peas, dominant for all seven of his independently assorting genes, was testcrossed. How many different kinds of gametes could the F1 PRODUCE?

Igfbp2 rbp4 and factor d post bariatric surgeryigfbp2 what

IGFBP2/ RBP4 and Factor D Post Bariatric Surgery IGFBP2 ( what the normal physiological action in the body? And how it affectedby obesity? andpost bariatric surgery?) RBP4 (what the normal physiological action in the bod ...

Assignment on nutrition - q1 task you need to select 2

Assignment on Nutrition - Q1. Task: You need to select 2 different age groups of your choice. You will need to plan balanced meals with snacks for a day. Once you have laid out the meal plan you need to: Explain why the ...

Question - gene cloning a please write the steps to clone

Question - Gene Cloning a) Please write the steps to clone the protease gene from Bacillus strain whose genome sequence is not known. b) Express the protease gene to obtain the enzyme in high yield, please plan your prot ...

Instructions address each question below as it relates to

Instructions: Address each question below as it relates to the caw study given. A patient was brought to the Emergency Department by ambulance with two arrow wounds. One arrow is still in the patient on the left side; en ...

Use of molecular tools and bioinforrnatics in the diagnosis

Use of Molecular Tools and Bioinforrnatics in the Diagnosis Characterization of Enteric Pathogens from a Case Study Purpose: The purpose of this project is to familiarize the student with modern molecular tools and bioin ...

Experiment 1 staining video1 open the media player by

Experiment 1: Staining Video 1. Open the Media Player by clicking on the film-strip button in the lower left of the lab's window frame, as shown below. The Media Player is a repository of images, videos, saved snapshots, ...

Chosen dr jan nolta- stem cell researcher head of uc davis

Chosen Dr. Jan Nolta- Stem Cell Researcher Head of UC Davis Stem Cell Program Director Topic Background: early Stem cells have the ability to develop into many different types of cells. Stem Cell Research is not without ...

  • 4,153,160 Questions Asked
  • 13,132 Experts
  • 2,558,936 Questions Answered

Ask Experts for help!!

Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

Ask Now Help with Problems, Get a Best Answer

Why might a bank avoid the use of interest rate swaps even

Why might a bank avoid the use of interest rate swaps, even when the institution is exposed to significant interest rate

Describe the difference between zero coupon bonds and

Describe the difference between zero coupon bonds and coupon bonds. Under what conditions will a coupon bond sell at a p

Compute the present value of an annuity of 880 per year

Compute the present value of an annuity of $ 880 per year for 16 years, given a discount rate of 6 percent per annum. As

Compute the present value of an 1150 payment made in ten

Compute the present value of an $1,150 payment made in ten years when the discount rate is 12 percent. (Do not round int

Compute the present value of an annuity of 699 per year

Compute the present value of an annuity of $ 699 per year for 19 years, given a discount rate of 6 percent per annum. As