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Chapter 27: Problem 3

What is genetic polymorphism? What is the source of genetic variation?

Short Answer

Expert verified
Genetic polymorphism is the occurrence of multiple forms or varieties of individuals among the members within a species. The source of genetic variation is primarily through mutation, gene flow, and sexual reproduction.

Step by step solution

01

Understanding Genetic Polymorphism

Genetic Polymorphism refers to the existence of two or more variants of a particular DNA sequence among a species' individuals. It is the occurrence of multiple forms or varieties in the individuals among members of a single species. It illustrates the genetic diversity.
02

Exploring the source of Genetic Variation

The source of genetic variation is primarily through mutation, gene flow, and sexual reproduction. Mutation: A change in the DNA sequence within a gene. This random alteration can lead to variations among individuals within species. Gene flow: The transfer of genetic variation from one population to another. This can happen when organisms migrate and mate with members of a different population.Sexual reproduction: The combining of genes from two parents during reproduction leading to offspring with a combination of traits from the parents. This leads to variation as each offspring has a unique set of genes.

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Most popular questions from this chapter

When two populations frequently intermix due to migration, what are the long- term consequences with regard to allele frequencies and genetic variation?

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?

Does inbreeding affect allele frequencies? Why or why not? How does it affect genotype frequencies? With regard to rare recessive diseases, what are the consequences of inbreeding in human populations?

With regard to genetic drift, are the following statements true or false? If a statement is false, explain why. A. Over the long run, genetic drift leads to allele fixation or loss. B. When a new mutation occurs within a population, genetic drift is more likely to cause the loss of the new allele rather than the fixation of the new allele. C. Genetic drift promotes genetic diversity in large populations. D. Genetic drift is more significant in small populations.

For the term genetic drift, what is drifting? Why is this an appropriate term to describe this phenomenon?
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