Exam 18: Genomes and Their Evolution

-The figure above shows a diagram of blocks of genes on human chromosome 16 and the locations of blocks of similar genes on four chromosomes of the mouse.Which of the following descriptions represents another example of the same phenomenon that is responsible for the rearrangements depicted in the figure above?

Several different globin genes are expressed in humans,but at different times in development.What mechanism could allow for this?

Homeotic genes contain a homeobox sequence that is highly conserved among very diverse species.The homeobox encodes a protein domain that binds to DNA to regulate development of the embryo.The selective expression of homeotic genes,over time and space,is central to pattern formation during development.Based on this information,which of the following statements would you expect to be correct?

Genetic variation among humans is relatively small when compared to other species.Where in the human genome does most of the diversity occur?

Which of the following statements correctly describes the manner in which transposons and retrotransposons are copied before they move around in a genome?

Two eukaryotic proteins have one domain in common but are otherwise very different.Which of the following processes is most likely to have contributed to this similarity?

-The figure above shows a diagram of blocks of genes on human chromosome 16 and the locations of blocks of similar genes on four chromosomes of the mouse.What does the movement of these blocks in the genomes suggest?

Which of the following statements most correctly describes the whole-genome shotgun approach for sequencing a genome?

In most eukaryotes,only about 1.5% of the genome codes for proteins.What types of sequences make up the rest of the genome?

What is metagenomics?

What is bioinformatics?