Which of the following would result in reproductive isolation?
A. Two populations of crickets are indistinguishable in physical features, but the females in each group only come to the different songs of their males.
B. One brood of the seventeen-year cicada emerged in 1987 (and will do so every 17 years) and lives a few months as adults; another brood emerged in 1992 (and will do so every 17 years); the larvae of both feed side-by-side on tree roots.
C. Fruit flies on one Hawaiian island live for hundreds of generations and do not come in contact with fruit flies on another island except when blown there by rare tropical storms.
D. A lion and a tiger mate in the artificial confines of a zoo but the offspring is infertile.
E. All of the choices are correct.
Answer: E
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Given what you now know, what information is most likely to produce the correct answer?
What will be an ideal response?
Rattlesnakes strike and inject venom into prey and then release the prey item and follow it
until the venom takes its effect. Typically, rattlesnakes strike at the base of the skull, and their strike accuracy is very high. Because the brain is very active, it produces a lot of heat, and this is detected by the snakes with __________ located in pit organs on the anterior region of the head.
a. thermoreceptors b. photoreceptors c. chemoreceptors d. pain receptors
Which of the following is a transition mutation?
A) ACC to CCC B) A to G C) GG to AA D) A to T
From this figure and your knowledge of geological time scales, we can infer that:
1.Fossils found at point A are similar to those found at point B.
2.The rock formations of region B are much more recent than those of region C.
3.The rock layers and life forms found within are older as you move from layer D to layer A.
4.There are no generalizations to make. You have to carbon date everything regardless of what layer the fossil is found in.
