Multiple Choice
Which of the following is a recombinant pattern found in Sordaria asci?
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3. Extensions to Mendelian Inheritance
Overview of interacting Genes
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Which characteristic distinguishes an insertion sequence from other DNA sequences found in a cell?
A
It contains only the genes necessary for transposition.
B
It is always located at the telomeres of chromosomes.
C
It encodes multiple proteins involved in cellular metabolism.
D
It is composed entirely of repetitive satellite DNA.
Verified step by step guidance1
Understand what an insertion sequence (IS) is: it is a simple transposable element found in bacterial DNA that can move from one location to another within the genome.
Recall that insertion sequences typically contain only the genetic information necessary for their own movement, specifically the gene encoding transposase, the enzyme that facilitates transposition.
Compare this to other DNA sequences in the cell, such as genes encoding proteins for metabolism, repetitive satellite DNA, or sequences located at specific chromosomal regions like telomeres.
Recognize that unlike complex transposons or other DNA elements, insertion sequences do not carry additional genes beyond those required for transposition.
Conclude that the distinguishing characteristic of an insertion sequence is that it contains only the genes necessary for transposition.
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