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SNPs and STRs Quiz

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Questions and Answers

Which type of polymorphism is characterized by the repetition of two or more nucleotides in multiple copies directly adjacent to one another in a DNA sequence?

Single-nucleotide polymorphism (SNP)

Short tandem repeat (STR) (correct)

Insertion/deletion polymorphism

Copy number variation

What is the typical length range of repeated sequences in short tandem repeats (STRs)?

8 to 15 nucleotides

4 to 10 nucleotides

2 to 7 nucleotides (correct)

1 to 3 nucleotides

What is the frequency of each variation in a single-nucleotide polymorphism (SNP) within a population?

Around 10%

More than 90%

Approximately 50%

Less than 1% (correct)

Where are short tandem repeats (STRs) typically found in the genome?

<p>Non-coding intronic regions of genes</p> Signup and view all the answers

How are alleles of short tandem repeats (STRs) often characterized?

<p>By the number of repetitions of the short sequence</p> Signup and view all the answers

Study Notes

Polymorphisms in DNA Sequences

Microsatellites: characterized by the repetition of two or more nucleotides in multiple copies directly adjacent to one another in a DNA sequence.

Short Tandem Repeats (STRs)

Length range: typically ranges from 2-10 nucleotides, with repeat units ranging from 5-100 copies.
Genomic location: typically found in non-coding regions of the genome, such as introns, and intergenic regions.
Allele characterization: alleles are often characterized by the number of repeat units present.

Single-Nucleotide Polymorphisms (SNPs)

Frequency of variation: the frequency of each variation within a population is typically greater than 1%.

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Description

Test your knowledge on Single-Nucleotide Polymorphisms (SNPs) and Short Tandem Repeats (STRs) with this quiz. Learn about the variations in nucleotides and their frequencies within populations.