TLS Online TPP Program

#Question id: 8897


Which of the following statements would be least acceptable to most zoologists?

#Unit 9. Diversity of Life Forms
  1. The extant cephalochordates (lancelets) are contemporaries, not ancestors, of vertebrates.
  2. The first fossils resembling cephalochordates appeared in the fossil record around 550 million years ago.
  3. Recent work in molecular systematics supports the hypothesis that cephalochordates are the most recent common ancestor of all vertebrates.
  4. The extant cephalochordates are the immediate ancestors of the fishes.
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TLS Online TPP Program

#Question id: 3273

#Unit 11. Evolution and Behavior

The number of forward mutations is equal to the number of reverse mutations then

a) Population is in equilibrium for forward and reverse mutation rates

b) The population is being in Hardy–Weinberg equilibrium

c) No further change in allelic frequency

TLS Online TPP Program

#Question id: 3276

#Unit 11. Evolution and Behavior

Which of these conditions are always true of populations evolving due to natural selection?

Condition 1: The population must vary in traits that are heritable.

Condition 2: Some heritable traits must increase reproductive success.

Condition 3: Individuals pass on most traits that they acquire during their lifetime.

TLS Online TPP Program

#Question id: 3277

#Unit 11. Evolution and Behavior

Which of the following describes the most likely order of events in allopatric speciation?

TLS Online TPP Program

#Question id: 3278

#Unit 11. Evolution and Behavior

What does the biological species concept use as the primary criterion for determining species boundaries?

TLS Online TPP Program

#Question id: 3279

#Unit 11. Evolution and Behavior

Which two of the following have operated to increase divergence between mosquito fish populations on island?

a. improved gene flow

b. bottleneck effect

c. sexual selection

d. founder effect

e. natural selection

TLS Online TPP Program

#Question id: 3280

#Unit 11. Evolution and Behavior

Small populations are threatened by the loss of genetic diversity from

a. Inbreeding

b. Genetic drift

c. Limited mating