Important implications of the theory of evolution by natural selection include (select all that apply):
a. All organisms, including humans, are descended from a common ancestor.
b. The biological world is constantly evolving.
c. Nature designs things intentionally.
d. Traits found in organisms are the outcomes of a goal-less process.
e. Humans occupy one ordinary branch on an enormous tree of life.
John Endler performed an experiment involving guppies in which he demonstrated evolution driven by natural selection that worked through a predator-prey relationship. Which of the following are true statements about the results of his experiments? (Select all that are correct.)
a. Males with longer tails and brighter coloration were more frequently eaten by predator fish.
b. Females preferred to mate with dull- colored males.
c. When males were put in a predator- free environment, brighter coloration and larger tails evolved in them.
d. In the predator-free environment, the average brightness of females increased.
e. When predators were reintroduced, duller coloration and smaller tails evolved in the males.
One of the motives put forth for human cloning is that people want to replace children or other loved ones who have died. To what extent could a clone of a loved one be a replacement for that person? If the technique had then been available, should doctors in the nineteenth century have preserved the DNA of Abraham Lincoln for cloning?
How is biotechnology defined?
a. the study of technical biology
b. the use of biology to control technological processes as a means of meeting societal needs
c. the use of technology to control biological processes as a means of meeting societal needs
d. the technological process of cloning genes
e. the commercialization of biological research results