Systematics is:
a. the study of naming and assigning organisms.
b. the evolutionary history of a specific organismal group.
c. the study of the diversity of life to understand its evolutionary history.
d. the practice of arranging organisms into a hierarchy.
e. All of the above are correct.
Ans: c. the study of the diversity of life to understand its evolutionary history.
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Reinforcement is most likely to drive the evolution of
A. prezygotic isolating mechanisms, because selection favors alleles that prevent hybridization. B. postzygotic isolating mechanisms, because selection acts after the formation of hybrids. C. prezygotic isolating mechanisms, because selection favors alleles that promote hybridization. D. postzygotic isolating mechanisms, because hybrids have low fitness relative to the parents.
The surfaces of clay particles in soil ____
a. often bear positively charged ions b. release water to plants easily c. often bear negatively charged ions d. are generally hydrophobic e. acidify the soil
Which statement is TRUE?
a. Environment can readily alter some genotypes. b. Genotype is manifested in phenotype. c. Unlike phenotypic variation, genetic variation is easily observable. d. Variation dies with individuals. e. Phenotype is seen physically in the genotype.
Nonsteroid hormones cannot cross the plasma membrane of cells, yet still have the ability to influence cell activity. Explain how this is possible
What will be an ideal response?