_____ is the original source of new alleles
a. Mutation
b. Natural selection
c. Genetic drift
d. Gene flow
e. All are original sources of new alleles
A
You might also like to view...
Pre-mRNA is found____
a. only in prokaryotes b. in both the nucleus and cytoplasm of eukaryotes c. only in the cytoplasm of eukaryotes d. in both prokaryotes and eukaryotes e. only in the nucleus of eukaryotes
Lyme disease involves
A. early symptoms of fever, headache, and stiff neck. B. people exposed to wooded or forested areas. C. treatment with antimicrobials. D. crippling polyarthritis, cardiovascular issues, and neurological problems. E. All of the choices are correct.
Based on archaeological evidence, the first spears were made by:
a. Australopithecus africanus. b. Neandertals. c. Homo erectus. d. Cro-Magnons. e. Homo habilis.
Two species of frogs belonging to the same genus occasionally mate, but the offspring do not complete development. What is the mechanism for keeping the two frog species separate?
A) the postzygotic barrier called hybrid inviability B) the postzygotic barrier called hybrid breakdown C) the prezygotic barrier called hybrid sterility D) gametic isolation E) adaptation