A farmer performs truncation selection to try to increase the weight of peaches in his orchard. Which statement correctly describes a possible outcome of this selection?
A) If peach weight is not heritable, the average weight in the next generation will increase.
B) If peach weight is heritable, the average weight in the next generation will increase.
C) The average peach weight will decrease due to this inbreeding.
D) If peach weight is heritable, the average weight in the next generation will decrease.
B) If peach weight is heritable, the average weight in the next generation will increase.
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Experimentally offering newborn coastal and inland garter snakes banana slugs demonstrated that ________
a. only the coastal variety of garter snakes carry the for gene b. coastal garter snakes instinctively reject toxic banana slugs c. there is a genetic basis to food preference in garter snakes d. snakes eat whatever food provides the appropriate stimulus to their nervous system
The movement of earthworms is dependent on
a. circular muscles. b. longitudinal muscles. c. hydrostatic skeleton. d. setae. e. all of these.
Antibiotics kill bacterial cells but do not (usually) damage human cells by taking advantage of the difference between human and bacterial cells. These differences include
A) bacterial cells have cell walls, human cells do not. B) bacterial ribosomes are larger than those of humans. C) protein synthesis in bacteria is identical to that in human cells. D) bacterial cells have a cell membrane, human cells do not. E) human and bacterial DNA are enclosed in a nucleus.
Failure of thymus development may result in
A) type I diabetes. B) Grave's disease. C) Bruton-type agammaglobulinemia. D) DiGeorge syndrome. E) chronic granulomatous disease.