A small angle for a branch point in an evolutionary tree indicates
A. extinction.
B. punctuated equilibrium.
C. gradualism.
D. convergent evolution.
E. temporal isolation
C. gradualism.
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When species are kept separate by preventing the formation of hybrid zygotes, the mechanism that keeps the species separate is known as a _____________ isolating mechanism.
A. hybridization B. postzygotic C. prezygotic D. adaptive E. differential
The _______ definition of species says that a species is a group of organisms that are reproductively isolated from other such groups.
Fill in the blank(s) with the appropriate word(s).
Which of the following provides the likeliest explanation for the differences seen in the human population?
A. presence of parasites in different areas B. amount of sunlight in different areas C. the altitude in different areas D. natural selection
If you tagged organic carbon inside a chloroplast with a fluorescent label, the location most likely to have a high concentration of labeled carbon would be in the
A. Inside the thylakoid B. Stroma C. Thylakoid membrane D. Between the outer and inner membranes