What is implied by the concept that the genetic code is universal?
a. It is a recent evolutionary development.
b. It is different in every type of organism.
c. It frequently changes.
d. It was established early in evolution.
Ans: d. It was established early in evolution.
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With few exceptions, we can't use observable traits to measure genetic variation in populations because:
A. observable traits don't vary enough among individuals to measure. B. we can't identify enough observable traits to be useful, even if they could be measured. C. many traits are encoded by large numbers of genes. D. observable traits are products of the environment as well as the genome. E. Many traits are encoded by large numbers of genes, and observable traits are products of the environment as well as the genome.
Compared to the parent cell, each of two daughter cells that result from normal mitotic division contains ____
chromosomes and is genetically ____.
a. the same number of; different b. the same number of; identical c. half the number of; different d. half the number of; identical e. double the number of; identical
A chemical agent that dissolves lipids can damage
A) cells. B) bacterial endospores. C) enveloped viruses. D) nonenveloped and enveloped viruses. E) cells and enveloped viruses.
Most causes of speciation are relatively slow, in that they may take many generations to see changes, with the exception of _____
A) polyploidy B) reinforcement C) colonization D) natural selection