The ultimate source of all new alleles is
A) mutation.
B) chromosomal duplication.
C) genetic drift.
D) natural selection.
Answer: A
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________ is a two-step process that depends on the activity of at least two genera to carry out the oxidation of ammonia to nitrate.
Fill in the blank(s) with the appropriate word(s).
Primary carnivores are
a. tertiary consumers in the second trophic level. b. secondary consumers in the third trophic level. c. secondary consumers in the second trophic level. d. tertiary consumers in the fourth trophic level. e. secondary consumers in the first trophic level.
What is observed when syntenic genes are close enough to one another that they are unable to assort independently?
What will be an ideal response?
Beadle and Tatum began their studies with wild-type Neurospora. How is this organism best characterized?
a. A strain that only grows in the wild b. A mutant strain that will only grow in the lab on complete medium c. A strain that will not grow in the lab d. A virulent strain e. A normal phenotype that will grow on minimal medium