Why are transposable elements found much more often in...

Name: Problem 23, Chapter 15: Introduction to Genetic Analysis
Uploaded: 2020-08-11T00:04:33-08:00
Duration: 1 min 50 s
Channel: Courtney Burson
Description: Why are transposable elements found much more often in introns than in exons? a. Because transposable elements prefer to insert into introns b. Because transposable elements prefer to insert into exons c. Because transposable elements insert into both exons and introns but selection removes exon insertions d. None of the above are true.

Why are transposable elements found much more often in introns than in exons? a. Because transposable elements prefer to insert into introns b. Because transposable elements prefer to insert into exons c. Because transposable elements insert into both exons and introns but selection removes exon insertions d. None of the above are true.

Why are transposable elements found much more often in introns than in exons?
a. Because transposable elements prefer to insert into introns
b. Because transposable elements prefer to insert into exons
c. Because transposable elements insert into both exons and introns but selection removes exon insertions
d. None of the above are true.

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Key Concepts

Natural Selection and Purifying Selection

Natural selection, particularly in the form of purifying selection, acts to remove detrimental mutations from a population. Insertions of transposable elements in exons can impede normal protein function, leading to a deleterious effect on an organism’s fitness. As a result, even though transposable elements may insert randomly throughout the genome, selection tends to eliminate those that disrupt essential coding regions, leading to a higher retention of insertions in introns.

Introns and Exons

Genes are composed of coding regions known as exons and non-coding regions called introns. Exons contain information that is translated into proteins, while introns are typically removed during RNA processing. Because introns are non-coding, insertions in these regions are generally less harmful compared to those in exons, where any disruption can alter protein structure and function.

Transposable Elements

Transposable elements are sequences of DNA that can move to different positions within the genome. Their ability to transpose makes them agents of genomic variation, and they are found across a wide range of organisms. These elements can disrupt gene function if inserted into a critical region and are a major topic in genetics due to their role in evolution and genome dynamics.

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