A diagram of the evolutionary relationships between organisms is known as a phyl

Question

A diagram of the evolutionary relationships between organisms is known as a phylogeny, or phylogenetic tree. Which of the following statements about the construction of phylogenies is not true? O It reflects hierarchical classification of organisms. O It depends on the use of homology. O O O It can be based on DNA data. It is based on a direct observation of historical events. It can be based on fossil data. Comparing sequences between genes and between species allows for the evaluation of mutation rates. Which of the following has been observed? O Synonymous mutations occur at the same rate as nonsynonymous mutations. O Coding sequences have the same mutation rate as noncoding sequences. O All mutations occur at the same rate. O Introns have a higher mutation rate than exons. O Exons have a higher mutation rate than introns.

Explanation / Answer

Answer 1. The correct option is option 4. Phylogenetic analysis is not based on the direct observation of historical events.

Answer 2. The correct option is option 4. Introns have a higher rate of mutation than exons. Introns are under less selective pressure than exons and mutation in them will not cause damaging effects on a protein sequence which is encoded by an exon.

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