You collect individuals from different allopatric populations of a leaf-eating beetle. In the laboratory, you conduct mate-choice experiments to assess levels of reproductive isolation among beetles from different populations. Assuming that ecological speciation occurred in the wild, which pattern should you expect?
A. No reproductive isolation
B. Reproductive isolation that is independent of habitat type
C. More reproductive isolation among populations that share similar habitats
D. Less reproductive isolation among populations that share similar habitats
E. Complete reproductive isolation among all populations
Answer: D. Less reproductive isolation among populations that share similar habitats
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In your garden you decide to plant potatoes. You watch the above-ground development of your plant and decide to categorize the growth into four main stages:
1. The initial development of the stem and leaves (shoot) 2. The development of flowers and general growth of the shoot 3. A vegetative period where not much growth seems to be happening 4. The harvest of your potato crop (digging up the tubers formed near the base of the stem) In stage 2, which is a bigger "sink" for phloem flow? A. development of flowers B. growth of the shoot C. There is insufficient information to answer the question.
What is a disadvantage of asexual reproduction? a. It does not introduce variety into populations
b. Finding a mate is not required. c. It is not an efficient process. d. It can create high density of populations.
In female mammals, most genes on one of the two X chromosomes are permanently inaccessible, and
this phenomenon is called __________. Fill in the blank(s) with the appropriate word(s).
What factor affects the average temperature of a region?
A) the amount of cloud cover that exists B) the amount of light energy per unit area hitting it C) whether there's an El Niño that year D) the amount of precipitation it receives