Oceanic islands are not the only geographic habitats that can harbor isolated populations of individuals. What are some other examples of isolated "island" populations?
What will be an ideal response?
Any habitat that contains a boundary that the organism cannot cross is considered an "island"-for example, a mountaintop, a small pond in the middle of an arid region, or even a living host (for a parasite).
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Predict the outcome of an F+ to F- mating if the F+ cell lacked a functional tra operon.
A. Conjugation would not occur because there would be no contact between the F+ and F- cells. B. Upon entering the recipient, the F factor would be unable to integrate into to host chromosome. C. Conjugation would occur, but the F- recipient could not become Hfr. D. There would be no effect on conjugation.
Marsupials are more numerous in Australia than South America because of less competition with placental mammals.
Answer the following statement true (T) or false (F)
The shared primate characteristic depicted in Figure 22-1 is:
a. a prehensile appendage.
b. an opposable thumb.
c. an enlarged foramen magnum.
d. four grasping digits.
e. an opposable thumb.
The protein actin is found in the:
A) thin filaments. B) nucleus. C) thick filaments. D) membrane.