High School Biology Help » Genetics and Evolution » Genetics Principles » Hardy-Weinberg Equilibrium
Explanation:

Hardy-Weinberg equilibrium has a set of conditions that must be met in order for the population to have unchanging gene pool frequencies. There must be random mating, no mutation, no migration, no natural selection, and a large sample size.

You are watching: Which of these conditions is not among the requirements of the hardy-weinberg equilibrium?

It is not necessary for the population to be at carrying capacity. The population can grow or shrink while maintaining the gene pool.


A species of bird has an allele for black feathers and an allele for blue feathers. Which of the following scenarios would violate the necessary conditions for Hardy-Weinberg equilibrium in a population of this species?


Correct answer:

Birds with black feathers prefer to mate with birds that have similarly colored feathers


Explanation:

If a population is in Hardy-Weinberg equilibrium, there is no evolution taking place in the population. One of the violations of Hardy-Weinberg equilibrium is selective mating. If birds prefer to mate with others that are similarly colored, then Hardy-Weinberg equilibrium is violated and the gene pool in the population is changing.

Hardy-Weinberg requires no migration, random mating, large population size, no natural selection, and no mutation.


Which of the following is not one of the major causes of evolutionary change as outlined by Hardy-Weinberg equilibrium?


Explanation:

The Hardy-Weinberg principle is a mathematical model proposing that, under certain conditions, the allele frequencies and genotype frequencies in a sexually reporoducing population will remain constant over generations. For this principle to hold true, evolution must essentially be stopped. The conditions to maintain the Hardy-Weinberg equilibrium are: no mutation, no gene flow, large population size, random mating, and no natural selection.

The Hardy-Weinberg equilibrium can be disrupted by deviations from any of its five main underlying conditions. Therefore mutation, gene flow, small population, nonrandom mating, and natural selection will disrupt the equilibrium.

Differentiation is the process whereby relatively unspecialized cells become specialized into particular tissue types. This is a standard process in organismal development, and is generally unrelated to evolutionary principles.


Report an Error

Example Question #1 : Understanding Hardy Weinberg Conditions


Which of the following is NOT one of the assumptions made by Hardy and Weinberg regarding Hardy-Weinberg equilibrium?


Possible Answers:

Random mating


No spontaneous mutations


All of these are assumptions made by Hardy and Weinberg in their equilibrium model.


No immigration or emigration 


The population size is large


Correct answer:

All of these are assumptions made by Hardy and Weinberg in their equilibrium model.


Explanation:

All of the answer choices are assumptions made when considering Hardy-Weinberg equilibrium. Thus, the model is not very realistic in nature, since these conditions are rarely met. Also, no natural selection is assumed to occur.


Report an Error

Example Question #1 : Understanding Hardy Weinberg Conditions


A lake contains a population of twelve bluegill fish, 8 with red spots and 4 with no red spots. The fish are healthy and strong, all exactly the same except for the coloring. Fishermen visit the lake, and catch 7 fish with red spots and 1 fish with no red spots, leaving 1 with red spots and 3 without red spots remaining in the lake. This change in the population is an example of __________.


Possible Answers:

natural selection


mutation


genetic drift


gene flow


migration


Correct answer:

genetic drift


Explanation:

All the factors listed are factors that can change the genetic equilibrium of a population. Genetic drift is a random change in the frequency of alleles, as in this question—at first, there were more red-spotted fish than spotless fish (a 2:1 ratio), but once the random fishing took place, there were fewer red-spotted fish than spotless fish (a 1:3 ratio). This selection by chance is genetic drift.

Gene flow is the movement of alleles into or out of a population, generally due to patterns of migration.

Migration is the physical departure or arrival of organisms between different populations or geographical locations.

Natural selection is the increased prevalence of "favorable" traits and genes, and the decline in prevalence of "unfavorable" traits and genes.

Mutation is a genetic alteration that results in a new DNA sequence. Mutation is responsible for the creation of new alleles, traits, and phenotypes.


Report an Error

Example Question #6 : Understanding Hardy Weinberg Conditions


Which of the following is not an application of the assumptions underlying Hardy-Weinberg equilibrium?


Possible Answers:

A population of 2,000,000 mosquitos flying over a body of water


Two populations of island rabbits, separated by 5 miles of ocean


A male bird with large and bright feathers is more fit than other birds


Mutation-free DNA replication


A researcher randomly dividing fruit flies into mating groups


Correct answer:

A male bird with large and bright feathers is more fit than other birds


Explanation:

For Hardy-Weinberg equilibrium to be in effect, five conditions must be met:

1. Large Population

2. Isolated populations (no immigration or emigration)

3. No spontaneous mutations

4. Mating is random

5. No natural selection


Report an Error

Example Question #1 : Understanding Hardy Weinberg Conditions


Which of these factors would not contribute to Hardy-Weinberg equilibrium?


Possible Answers:

Natural selection


Large population 


Random mating


Closed system


Correct answer:

Natural selection


Explanation:

Hardy-Weinberg equilibrium describes no change in genotypic frequencies over multiple generations. This is not likely to be seen in nature due to multiple factors, but it can be a useful theory for scientists. Hardy-Weinberg equilibrium requires no immigration or emigration, a large population, random mating, and no spontaneous mutations (all of which are virtually unavoidable in nature). Natural selection would violate these conditions.


Report an Error

Example Question #8 : Understanding Hardy Weinberg Conditions


If all Hardy-Weinberg conditions are met, what will be the result? 


Possible Answers:

Elimination of homozygote individuals 


Elimination of heterozygote individuals 


Constant fluctuation in genotypic frequencies 


No change in genotypic frequencies 


Correct answer:

No change in genotypic frequencies 


Explanation:

Hardy-Weinberg equilibrium describes no change in the genotypic frequencies of a population. After one generation, assuming random mating, a closed system, a large population, and no random mutations, the genotypic frequencies of the population will not change.


Report an Error

Example Question #1 : Hardy Weinberg Equilibrium


Consider a population in Hardy-Weinberg equilibrium. A gene in the population has two alleles. The gene pool shows a distribution of 80% of the dominant allele and 20% the recessive allele.


What percentage of the population is heterozygous for the trait?


Possible Answers:


*


*


*


Correct answer:


Explanation:

Since the population is in Hardy-Weinberg equilibrium, we can use the following equation to determine the genotypic frequencies for the allele in question:

*

In this equation, 

*
represents the frequency of the dominant allele and 
*
represents the frequency of the recessive allele. The 
*
portion of the expression represents the frequency of heterozygotes in the population. Using the allelic frequencies given in the question, we can calculate the percentage of heterozygous individuals.

*

*

32% of the population is heterozygous for the trait.


Report an Error

Example Question #2 : Hardy Weinberg Equilibrium


In an isolated population of ants in the Amazon rainforest, color is determined by a single gene. Ants that are homozygous dominant (BB) and heterozygous (Bb) for this gene are black, but ants that are homozygous recessive (bb) for this gene are brown. 


If the phenotype frequencies are 0.75 black and 0.25 brown, what are the allele frequencies within this population?


Possible Answers:


Correct answer:


Explanation:

We can use the Hardy-Weinberg equations to solve this question:

*

*

We know that the black allele (B) is dominant and the brown allele (b) is recessive.

Using these two equations, we know that 0.25 are homozygous recessive (brown). This value will be equal to 

*
.

We can then solve as follows:

*

*

Therefore, we know that the frequency of each allele is equal to 0.5.

See more: Looks Like We Made It Theme Song, Looks Like We Made It By Barry Manilow


Report an Error
← Previous 1 2 Next →
View Tutors
Chloe Certified Tutor
Cornell University, Bachelor of Science, Biology, General.
View Tutors
Erin Certified Tutor
University of South Florida-Main Campus, Bachelors, Biology, General. Massachusetts Institute of Technology, PHD, Biological ...
View Tutors
Michael Certified Tutor
Stony Brook University, Bachelor of Science, Biology, General.

All High School Biology Resources


10 Diagnostic Tests 247 Practice Tests Question of the Day Flashcards Learn by Concept
Popular Subjects
SSAT Tutors in Seattle, SSAT Tutors in Denver, Math Tutors in Seattle, Statistics Tutors in Miami, Spanish Tutors in Boston, GRE Tutors in Los Angeles, English Tutors in Denver, MCAT Tutors in Washington DC, Calculus Tutors in Los Angeles, Computer Science Tutors in Phoenix
Popular Courses & Classes
GMAT Courses & Classes in Denver, Spanish Courses & Classes in San Francisco-Bay Area, SSAT Courses & Classes in New York City, ACT Courses & Classes in Dallas Fort Worth, ACT Courses & Classes in Washington DC, ISEE Courses & Classes in Boston, GRE Courses & Classes in Los Angeles, SAT Courses & Classes in Miami, ACT Courses & Classes in Philadelphia, LSAT Courses & Classes in Phoenix
Popular Test Prep
MCAT Test Prep in Washington DC, ACT Test Prep in Philadelphia, LSAT Test Prep in New York City, ACT Test Prep in Dallas Fort Worth, GRE Test Prep in Miami, SSAT Test Prep in New York City, SSAT Test Prep in Miami, GMAT Test Prep in Boston, GRE Test Prep in Los Angeles, ACT Test Prep in New York City
Report an issue with this question

If you"ve found an issue with this question, please let us know. With the help of the community we can continue to improve our educational resources.


Do not fill in this field
* Your Name:
* Issue Description:
DMCA Complaint

Your Infringement Notice may be forwarded to the party that made the content available or to third parties such as ChillingEffects.org.

Please follow these steps to file a notice:

You must include the following:

Send your complaint to our designated agent at:

Charles Cohn Varsity Tutors LLC 101 S. Hanley Rd, Suite 300 St. Louis, MO 63105