Negative epistasis is:
a. only present in the homogametic sex.
b. a mechanism that explains the Dobzhansky–Muller model of reproductive isolation.
c. responsible for chromosomal rearrangements.
d. responsible for changes in ploidy.
B
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Why was it important that Darwin visited islands, and then compared island species with continental species?
A. Because Darwin found unique species on the islands. These island species did not have any of the characteristics of their ancestral continental species. B. Because Darwin's attention was drawn to the uniqueness of the island species, even though they retained some resemblance to continental species. C. Because Darwin's attention was drawn to the uniqueness and variety of finches on the islands, determining that their adaptations came from eating different food than continental species. D. Because Darwin saw very low reproductive survival rates on the island as compared to the mainland. E. Because Darwin observed continental species of finch flying to the islands.
A scientist could test how the traits of desert plants are adaptive by ____
a. transplanting individuals that have the trait into moister habitats b. selectively breeding individuals displaying that trait c. conducting straightforward experiments in the desert habitat d. crossing individuals in the desert with individuals in moister habitats e. comparing them to traits in related species from moister habitats
Mucus contains an enzyme called ____ that chemically attacks and kills bacteria
a. lysozyme b. peroxide c. lipase d. lactase e. protease
For a dichotomous treatment regression (X = 1 or 0), the mean outcome for the treated group (X = 1) is 35 and the mean outcome for the untreated group is 67. What will the slope of the regression line be?
A. 35 B. -32 C. 67 D. 67/2 = 33.5