TLS Online TPP Program

#Question id: 10324


Which of the following is not true of all horizontally oriented phylogenetic trees, where time advances to the right?

#Unit 9. Diversity of Life Forms
  1. Each branch point represents a point in absolute time.
  2. Organisms represented at the base of such trees are ancestral to those represented at higher levels.
  3. The more branch points that occur between two taxa, the more divergent their DNA sequences should be.
  4. The common ancestor represented by the rightmost branch point existed more recently in time than the common ancestors represented at branch points located to the left.
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TLS Online TPP Program

#Question id: 5809

#Unit 8. Inheritance Biology

Based on the physiological adaptation theory, bacterial populations that had not been exposed to T1 infection:

TLS Online TPP Program

#Question id: 5808

#Unit 8. Inheritance Biology

Mitochondrial DNA polymerase does not have an error checking mechanism such as that of nuclear DNA polymerase. This would be expected to lead to a higher rate of which type of mutation in mitochondrial DNA?

TLS Online TPP Program

#Question id: 5807

#Unit 8. Inheritance Biology

Which of the following would be an example of a germline mutation?

TLS Online TPP Program

#Question id: 5806

#Unit 8. Inheritance Biology

Which of these is NOT a mechanism by which a chromosome rearrangement could affect gene function?

TLS Online TPP Program

#Question id: 5805

#Unit 8. Inheritance Biology

In Himalayan rabbits, the ears, feet, and muzzle are pigmented while the rest of the body is white. This is because they express an enzyme variant that is ineffective at body temperature but functions at the lower temperatures experienced by cells of the extremities. This is an example of:

TLS Online TPP Program

#Question id: 5804

#Unit 8. Inheritance Biology

The gene that is mutated in cases of cystic fibrosis encodes an ion transporter protein normally expressed in the respiratory and digestive tracts along with other locations. Individuals homozygous for the most common mutation in this gene (ΔF508) died at very early ages prior to the advent of advanced medical intervention. Despite this, the mutation exists at relatively high frequency in populations of European descent. One potential explanation is that heterozygotes for such mutations may be relatively immune to the lethal effects of diseases such as typhoid fever. Which statement below is most accurate?