Sometimes the most abundant color form of an animal is preyed upon more extensively than less common forms. This
illustrates the phenomenon of ____ selection.
a. stabilizing
b. directional
c. disruptive
d. frequency-dependent
e. artificial
ANSWER: d
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You begin an experiment with two populations of E. coli that are each composed of 100 cells. The cells are all genetically identical (i.e., they are clones)
You grow these populations in flasks on a lab bench under identical conditions with unlimited resources. Which of the following statements about the populations are true? ____ Natural selection begins operating immediately on the populations. ____ Initial differences in population will be adaptations to the new environment. ____ Initial differences in the population will be the result of sexual selection. ____ Initially mutation will be the only source of variation in the population. ____ Initially these populations will be in H-W equilibrium. ____ Speciation cannot occur because the two populations are identical. ____ After 100 generations both populations will still be genetically the same, having accumulated the same mutations over time. ____ Natural selection cannot occur because bacteria are haploid, so there is no individual variation. ____ Speciation can only occur after there is enough variation in the population for natural selection to act upon. ____ Speciation can occur between these populations through genetic drift alone. What will be an ideal response?
The set of proteins in a particular cell type is always equal to the number of genes in the genome
a. True b. False Indicate whether the statement is true or false
Four of the five answers listed below are
related to translation. Select the EXCEPTION.
a. ribosomes b. transcription c. DNA polymerase d. mRNA e. tRNA
What percentage of people in this population have short fingers and toes?
A) 0% B) 16% C) 36% D) 64% E) 84%