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Chapter 27: Problem 1

What is the gene pool? How is a gene pool described in a quantitative way?

Short Answer

Expert verified
A gene pool is the total of all different genes present in a population. It can be described in a quantitative way by calculating allele frequencies, which tell us the relative proportion of different alleles within the population.

Step by step solution

01

Define Gene Pool

A gene pool can be defined as the total of all the different genes present in a population. It encompasses the full genetic diversity available within a particular group of organisms.
02

Quantitative Description of a Gene Pool

A gene pool can be described quantitatively by calculating allele frequencies. An allele frequency is defined as the relative proportion of an allele within a population. It can be calculated by dividing the number of a certain allele by the total number of alleles in the population. The result is a numerical representation, which often is presented as a percentage or a fraction.
03

Example Calculation of Allele Frequency

For example, if in a population of 100 animals, 70 individuals are carrying Allele A and 30 individuals carry Allele B for a particular gene. So the frequency of Allele A is\( \frac{70}{100} = 0.7 \) or 70%, and the frequency of Allele B is \( \frac{30}{100} = 0.3 \) or 30%.

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Most popular questions from this chapter

Antibiotics are commonly used to combat bacterial and fungal infections. During the past several decades, however, antibioticresistant strains of microorganisms have become alarmingly prevalent. This has undermined the effectiveness of antibiotics in treating many types of infectious disease. Discuss how the following processes that alter allele frequencies may have contributed to the emergence of antibiotic-resistant strains: A. Random mutation B. Genetic drift C. Natural selection

Two populations of antelope are separated by a mountain range. The antelope are known to occasionally migrate from one population to the other. Migration can occur in either direction. Explain how migration affects the following phenomena: A. Genetic diversity in the two populations B. Allele frequencies in the two populations C. Genetic drift in the two populations

For a gene existing in two alleles, what are the allele frequencies when the heterozygote frequency is at its maximum value, assuming Hardy-Weinberg equilibrium? What if there are three alleles?

In a population, the frequencies of two alleles are \(B=0.67\) and \(b=\) \(0.33\). The genotype frequencies are \(B B=0.50, B b=0.37\), and \(b b=\) \(0.13\). Do these numbers suggest inbreeding? Explain why or why not.

Describe the similarities and differences among directional, balancing, disruptive, and stabilizing selection.
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