Triploids are usually autopolyploids. They arise spontaneously in nature, but they can be constructed by geneticists from the cross of a 4n (tetraploid) and a 2n (diploid). Triploids are characteristically sterile due to

#Question id: 4629

#Unit 9. Evolution & Diversity of Life Forms

In the mid-1900s, the Soviet geneticist Lysenko believed that his winter wheat plants, exposed to ever-colder temperatures, would eventually give rise to ever more cold-tolerant winter wheat. Lysenkoʹs attempts in this regard were most in agreement with the ideas of

#Question id: 4630

#Unit 9. Evolution & Diversity of Life Forms

Which pair would have been likely to agree that strata such as those depicted here were deposited gradually over long periods of time by subtle mechanisms that are still at work?

#Question id: 4631

#Unit 9. Evolution & Diversity of Life Forms

As a young biologist, Charles Darwin had expected the living plants of temperate South America would resemble those of temperate Europe, but he was surprised to find that they more closely resembled the plants of tropical South America. The biological explanation for this observation is most properly associated with the field of

#Question id: 4632

#Unit 9. Evolution & Diversity of Life Forms

Which of these conditions should completely prevent the occurrence of natural selection in a population over time?

#Question id: 4633

#Unit 9. Evolution & Diversity of Life Forms

Natural selection is based on all of the following except

#Question id: 4634

#Unit 9. Evolution & Diversity of Life Forms

Which of the following represents an idea that Darwin learned from the writings of Thomas Malthus?