Most mutations lead to a decreased chance of survival for the mutant organism. Rarely, a mutation can provide an increased chance of survival. These rare mutations provide a(n) _____________________ for the mutant
a. adaptive
b. directional shift
c. selective disadvantage
d. environmental susceptibility
e. selective advantage
E
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In humans, ability to roll the tongue (R) is dominant to being unable to roll (r). Having freckles (F) is dominant to having no freckles (f)
If a woman heterozygous for both traits married a man with no freckles who couldn't roll his tongue, what is the probability that they would have a freckled, tongue-rolling child? A. 9/16 B. 3/16 C. 1/16 D. 3/4 E. 1/4
Not all sponges have skeletons. If they do, their skeletons may be made of (select all that apply)
A. silica B. calcium carbonate C. bone D. protein E. carbohydrate
The global patterns of atmospheric circulation and precipitation occur because of
A. the cooling of the land. B. rising masses of warm air and sinking masses of cool air. C. the greenhouse effect. D. global differentials in sea surface temperature. E. winds blowing off of the world's major mountain chains.
All of the following events occur during the processing and splicing of pre-mRNA except _____
1.the mRNA is transported from the nucleus to the cytoplasm 2.introns are removed 3.exons are spliced together 4.5' cap is added 5.poly-A tail is added