Which elements are responsible for the greater part of plant wet weight?
a. carbon, nitrogen, oxygen
b. carbon, nitrogen, phosphorus
c. carbon, oxygen, hydrogen
d. carbon, hydrogen, potassium
e. carbon, nitrogen, potassium
Ans: c. carbon, oxygen, hydrogen
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Frozen human sperm were first used to conceive a child in
A) 1910. B) 1953. C) 1969. D) 1978.
A group of organisms sharing a derived
character is a
a. clade. b. taxon. c. tribe. d. community. e. population
Male mallards have had emerald green head feathers
and wings with metallic blue patches for hundreds of years, whereas female mallards have been drab, brown-feathered ducks. This phenotypic situation suggests that mallards may be an example of a. directional selection. b. polyploidy. c. allopatric speciation. d. disruptive selection. e. sexual selection
Imagine that smurfs live in widely separated groups and rarely interbreed, so geneticists know very little about them. On one occasion, two smurfs from different groups did mate. A big-footed, white smurf mated with a small-footed, blue smurf
Three offspring resulted: one big-footed and blue and two small-footed and blue. Which statement about the inheritance of color in smurfs is most likely to be correct? A) Blue is dominant to white. B) White and blue are codominant. C) White is dominant to blue.