Based on the graph below, the color of male guppies can be seen as a balance between positive and negative selections. Bright colors are an advantage in _____, but a disadvantage in _____.
A. attracting mates; avoiding predators
B. attracting mates; finding food
C. finding food; attracting mates
D. avoiding predators; attracting mates
E. avoiding predators; finding food
A. attracting mates; avoiding predators
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The figure above shows the distribution of pocket-mouse coat colors in several Arizona populations found either on light-colored granite substrate or on dark volcanic rock (dark substrate)
The Melanocortin-1 receptor (Mc1r) alleles, D and d, differ by four amino acids. Mice with DD and Dd genotypes have dark coats, whereas mice with the dd genotype are light colored. What sort of genotype frequencies might you expect to find in the Xmas, Mid, and O'Neill populations? A) Xmas-high DD frequency; Mid-high Dd frequency, O'Neill-high dd frequency B) Xmas-high Dd frequency; Mid-high DD frequency, O'Neill-high dd frequency C) Xmas-high Dd frequency; Mid-high dd frequency, O'Neill-high DD frequency D) Xmas-high dd frequency; Mid-high Dd frequency, O'Neill-high DD frequency E) Xmas-high dd frequency; Mid-high DD frequency, O'Neill-high Dd frequency
Electrons farthest from the nucleus have the ____________
A. least potential energy B. most kinetic energy C. least kinetic energy D. most potential energy E. same amount of energy as electrons closest to the nucleus
Veins throughout a leaf are formed by vascular epidermis
a. True b. False
What is occurring in step 6?
a. fission b. fusion c. fertilization d. the first meiotic division e. the second meiotic division