res that appear with the onset of puberty 31. A biological species: a. always lo
ID: 277029 • Letter: R
Question
res that appear with the onset of puberty
31. A biological species:
a. always looks different from other species.
b. always has a different chromosome number from that of other species.
c. is reproductively isolated from other species.
d. never occupies the same niche as other species.
32. The offspring of better-adapted individuals are expected to make up a larger proportion of the next generation. The most likely explanation is:
a. nonrandom mating.
b. gene flow.
c. natural selection.
d. genetic drift.
1. Explain what four criteria are necessary for natural selection to occur and what role each plays in the process of natural selection.
2. Theodosius Dobzhansky once stated: "Nothing in biology makes sense except in the light of evolution." Choose one topic from the first three units we discussed in this course, Ecological Theory, Cell Theory, or Genetic Theory, and explain how it supports the Theory of Evolution.
3. Describe how a population that first arrives on an oceanic island could evolve into several different species.
4. Describe three different ways variation in genetic information can be produced.
Explanation / Answer
31. The biological species can be defined as a group of interbreeding populations which remain reproductively isolated from other groups. The members of the species essentially resemble each other. They form phenetic clusters. The genes of the organisms are essentially shuffled around the gene pool of the species. They are not transferred to other groups. So, option c is the correct answer.
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