# Hardy Weinberg Practice Problems

Hardy Weinberg Practice Problems

Name:__ __Date:__ __Period:__ __

### Save your time - order a paper!

Get your paper written from scratch within the tight deadline. Our service is a reliable solution to all your troubles. Place an order on any task and we will take care of it. You won’t have to worry about the quality and deadlines

Order Paper NowHardy-Weinberg Practice Problems

** **

**p ^{2} + 2pq + q^{2} = 1 p + q = 1**

** **

__Problem 1:__ 1 in 1700 US Caucasian newborns have cystic fibrosis. C for normal is dominant over c for cystic fibrosis.

- When counting the phenotypes in a population why is cc the most significant?

- What is the frequency of cystic fibrosis in the above population (cc or q
^{2})?

__ALLELE FREQUENCY CALCULATIONS:__

- Why calculate “q” first?

- Why is it now easy to find “p”?

Now that you know p and q, the genotype frequencies can be calculated. GENOTYPE FREQUENCY CALCULATIONS:

- CC- Normal homozygous dominant = p
^{2}=

- Cc -carriers of cystic fibrosis = 2pq =

- How many of the 1700 of the population are homozygous dominant (Normal)?

- How many of the 1700 in the population are heterozygous (carriers)?

- It has been found that a carrier is better able to survive diseases with severe What would happen to the frequency of the “c” if there was an epidemic of cholera or other type of diarrhea producing disease?

__Problem 2____:__ 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?

**p ^{2} + 2pq + q^{2} = 1 p + q = 1**

** **

__Problem 3____:__ In a population that meets Hardy-Weinberg equilibrium, the dominant allele frequency (A) is 0.7. What is the frequency of homozygous recessive individuals?

__Problem 4____:__ In a population that meets Hardy-Weinberg equilibrium, 81% are homozygous for the recessive gene. What percentage of the population is expected to be homozygous dominant in the next generation?

__Problem 5____:__ In a population that meets Hardy-Weinberg equilibrium, 25% have the dominant phenotype. How many individuals are heterozygous for this trait in a population of 10,000?

__Problem 6____:__ In a population that meets Hardy-Weinberg equilibrium, the allele frequency is 0.36 dominant and 0.64 recessive. How many individuals in a population of 20,000 are expected to be homozygous recessive?