Which of the following taxonomic categories contains all the others listed here? order |
class |
Animals that possess homologous structures probably _____. are not related |
evolved from the same ancestor |
Systematists have used a wide variety of traits to reconstruct the phylogenies of particular groups of organisms. Which one of the following traits produces a good estimates of phylogeny?
molecular traits |
all of the above traits combined |
By definition a clade is _____ paraphyletic |
monophyletic |
Fossil evidence indicates that some dinosaurs had feathers. If birds are indeed descended from dinosaurs, feathers are what kind of character? shared derived character |
shared ancestral character |
What process actually increases the number of genes in an organism’s genome?
parsimony |
gene duplication |
Why do researchers use rRNA in investigations of relationships between taxa that diverged hundreds of millions of years ago? rRNA is never the nucleic acid chosen for comparisons. |
DNA coding for rRNA changes relatively slowly. |
Molecular clocks are based on the idea that _____. mutations occur once every generation |
on average neutral mutations arise at a constant rate |
Which process occurred frequently in the early history of the three domains on Earth, and makes determining phylogenetic relationships of that time difficult? alternative RNA splicing |
horizontal gene transfer |
Which observation supports the position of eukaryotes at the convergence of the "ring of life"? Eukaryotes and archaeans both lack peptidoglycan in their cell walls. |
The nuclear genome of eukaryotes contains genes from archaeans and from bacteria. |
Val Biology 26
Share This
Unfinished tasks keep piling up?
Let us complete them for you. Quickly and professionally.
Check Price