There are different versions of the gene that codes for fur thickness, one of which codes for
thicker fur and another that codes for thinner fur. In 1995, about 50 percent of the animals had
thicker fur, and the other 50 percent had thinner fur. In the spring of 2012, after several years
of low snow cover, 70 percent of the population had thicker fur, while only 30 percent had
thinner fur. This change in the population is an example of
a. an adaptation.
b. evolution.
c. natural selection.
d. homology.
B
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Which line in the graph represents the bag with the highest initial concentration of sucrose?
A) A B) B C) C D) D E) E
Suppose that an unknown organism from an alien planet is observed and found to have a diploid state only following fertilization. Meiosis follows and the majority of this organism's life is spent in a haploid state. Which multicellular organisms on Earth most closely resemble this type of life cycle strategy?
a. ferns b. maple trees c. humpback whale d. some algae
You would expect the Hox genes of a mosquito and a rabbit to be very _________
Fill in the blank(s) with the appropriate word(s).
Fruit ripening represents an example of positive feedback. Which one of the following statements accurately justifies why the process of fruit ripening involves positive feedback?
A) Once seeds have reached maturity, chemical signals increase enzymatic activity in fruit to convert sugars into starches, thicken pulp, and maintain color in the fruit. B) Once seeds have reached maturity, chemical signals block enzymatic steps that normally convert sugars into starches and sugars accumulate from photosynthetic activity within the fruit. C) Chemical signals initiate a process that triggers enzymatic activity, which involves converting starches into sugars, softening of pulp, and color change of fruit. D) Chemical signals shut down enzymatic activity within the fruit, which results in breakdown of starches into sugars, softening of pulp, and color change of fruit.