A pH of 10 is how many times as basic as a pH of 7?
a. 2
b. 3
c. 10
d. 100
e. 1000
E
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The logical scientific method for studying nature
includes all of the following EXCEPT:a. observing nature b. developing explanations c. testing the explanations d. genetically engineering test subjects
Lethal genes (genes that result in the failure to develop a vital organ or metabolic pathway) are nearly always recessive. Animal breeders who discover a unique trait and selectively breed to increase the occurrence of that trait often encounter a noticeable increase in lethal genes. Why?
A. "Pleiotropy"-the gene that is being selected for this trait may have the second effect of being lethal. B. The lethal recessive gene may be incompletely dominant. C. Spreading the gene among offspring of both sexes will increase the likelihood it will be sex-linked and expressed. D. "Epistasis"-selection for the desired trait may result in "uncovering" the lethal gene. E. The selective-mating of closely related individuals, or inbreeding, increases the chances that two recessive genes will "meet" in offspring.
In order for migration to alter allele frequencies in another population:
A) the gene pool of the migrating population must be different from the population it is joining. B) a large portion of the population must leave as new individuals arrive. C) the gene pools of the populations involved must be very similar. D) a large portion of the population must die off.
These slender, or gracile, australopithecines are found later in the fossil record than A. afarensis
A) founder effect B) Homo Habilis C) Latin binomial D) Australopithecus Africanus E) convergent evolution F) Ardipithecus ramidus G) Neanderthals H) chimpanzees I) Homo erectus J) astragalus