Competitive exclusion is based on the idea that:
a. one species will voluntarily allow the other to survive
b. no two species can completely occupy the same niche
c. the larger species will always dominate the smaller
d. competition is overrated as a factor in species survival
e. two species can live together if they share the same niche but use it at different times
b
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Which of the following was NOT one of
Darwin's observations? a. Most individuals have an equal chance to survive and reproduce. b. Changes in populations are gradual and take place over long periods of time. c. Members of the same species may exhibit considerable variation. d. Some characteristics are heritable and passed on to offspring. e. Some characteristics afford their possessor a better chance of survival.
An X-linked recessive gene (c) produces red/green color blindness. A normal woman whose father
was color blind marries a color-blind man. (a) What are the possible genotypes for the mother of the color-blind man? (b) What are the possible genotypes for the father of the color-blind man? (c) What are the chances that the first son will be color-blind? (d) What are the chances that the first daughter will be color-blind? What will be an ideal response?
Researchers discovered that a new strain of bacteria that cause tuberculosis (M. tuberculosis) taken from a dead patient has a point mutation in the rpoB gene that codes for part of the RNA polymerase enzyme
This mutant form of RNA polymerase does not function as well as the more common form of RNA polymerase. A commonly used antibiotic called rifampin does not affect the mutant rpoB bacteria. A researcher mixes M. tuberculosis with and without the rpoB mutation and adds the bacteria to cell cultures. Half the cell cultures contain only standard nutrients, while the other half of the cell cultures contain rifampin and the standard nutrients. After many cell generations, the researcher finds that _____. A) very few M. tuberculosis in the standard nutrient cell cultures carry the rpoB gene mutation, but almost all of the M. tuberculosis in the cell cultures with rifampin carry the rpoB mutation B) almost all M. tuberculosis in the standard nutrient cell cultures carry the rpoB gene mutation, but very few of the M. tuberculosis in the cell cultures with rifampin carry the rpoB mutation C) very few M. tuberculosis in any of the cell cultures carry the rpoB gene mutation D) almost all of the M. tuberculosis in both types of cell cultures carry the rpoB mutation
Uplift and formation of a mountain range divide a freshwater snail species into two isolated populations. Erosion eventually lowers the mountain range and brings the two populations together again, but when they mate, the resulting hybrids all produce
sterile young. This scenario is an example of A) sympatric speciation. B) allopatric speciation. C) incomplete speciation. D) diversifying speciation.