About 12,000 years ago, a mass extinction event occurred and 75% of the world's large mammal species were eliminated. While a small number of cheetahs managed to survive and restore the world's population of cheetahs, this event caused an extreme reduction of the cheetah's genetic diversity. Based on the principles of natural selection, which of the following is a consequence of their reduced genetic diversity?
A. Cheetahs within the same population do not vary in their reproductive success.
B. Cheetahs have never fully adapted to the current environment.
C. Cheetahs are unable to effectively compete with each other for resources.
D. Cheetahs have very little heritable variation, which will make it difficult for them to adapt as the environment changes.
Answer: D
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A cross between two pea plants results in 732 purple and 268 white plants. What is (are) the genotype(s) and phenotype(s) of the parents that produced these offspring?
A. both parents are heterozygous purple B. one parent is homozygous purple, second parent is homozygous white C. one parent is heterozygous purple, second parent is heterozygous white D. one parent heterozygous purple, second parent homozygous white E. one parent is homozygous purple, second parent is heterozygous white
By a currently favored hypothesis, species richness of a community is greatest between physical disturbances of _____ intensity or frequency
a. low c. high b. intermediate d. variable
The control in an experiment
a. makes the experiment valid. b. is an additional replicate for statistical purposes. c. reduces the experimental errors. d. minimizes experimental inaccuracy. e. allows a mixed group of comparisons among different organisms for the experimental group.
Which of the following consists of a protein coat surrounding a molecule of genetic material?
A) Protists B) Viruses C) Bacteria D) Archaea E) Prions