Question

You find a repetitive sequence with a 170 bp repeating unit in a new mammalian species. Most likely, this is a. a globin paralog. b. a LINE c. a short tandem repeat. d. a microsatellite. e. part of the centromere.

Answer 1

1. The repetitive sequence with a 170 bp repeating unit in a new mammalian species is most likely - (b.) a LINE

• LINEs are Long Interspersed Nuclear Elements. They are a class of dispersed repeated DNA consisting of repetitive sequences that can be 100s or 1000s base pairs in length. They are autonomous and retrotranscriptionally active elements, which means they can move in the genome.

2. A difference between G and an A at a particular nucleotide is an example of an- (a.) SNP

• An SNP is a Single Nucleotide Polymorphism. It is defined as a difference in one base pair at a particular site (SNP locus) within coding or non- coding regions of the genome. Simply, SNPs are those positions on the genome where some individuals have one nucleotide, say G and others have a different nucleotide, say A. Hence named as SNPs.