Two runners A and B start running from diametrically opposite points on a circular track in the same direction. If A runs at a constant speed of 8 km/h and B at a constant speed of 6 km/h and A catches up with B in 30 minutes , what is the length of the track?

#Question id: 3276

#Unit 9. Evolution & Diversity of Life Forms

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.

#Question id: 3277

#Unit 9. Evolution & Diversity of Life Forms

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

#Question id: 3278

#Unit 9. Evolution & Diversity of Life Forms

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

#Question id: 3279

#Unit 9. Evolution & Diversity of Life Forms

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

#Question id: 3280

#Unit 9. Evolution & Diversity of Life Forms

Small populations are threatened by the loss of genetic diversity from

a. Inbreeding

b. Genetic drift

c. Limited mating

#Question id: 3281

#Unit 9. Evolution & Diversity of Life Forms

One population X has 750 AA, 0 Aa, and 250 aa; the other Y has 500 AA, 500 Aa, and 0 aa. After one generation of random mating, the genotype frequencies X and Y respectively if the population size remains 1,000.