Which of the following describes reinforcement of reproductive isolation?
A. The physical separation of two populations
with diverging characteristics
B. The reduced fitness of hybrid offspring
C. The ability to identify and preferentially
mate with only members of the same
population
D. An outbreak of disease that wipes out one
of the two populations that would otherwise
mate and form hybrid offspring
C
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Which may be or is an RNA molecule?
A. AGCCTAC B. GGGCCCA C. GCCCUUA D. AGCCTAC AND GGGCCCA E. GGGCCCA AND GCCCUUA
Allopatric speciation requires
a. accelerated gene flow. b. physical separation. c. physical diversity. d. behavioral diversity. e. all of these.
A population includes
a. all organisms of the same species in one place at a given moment. b. the organisms and their physical environment. c. the physical environment in which an organism exists. d. all organisms within the environment at a given moment.
Secondary growth of stems is very common in
A. dicots and conifers B. monocots and conifers C. nonvascular plants D. flowering plants