Arctic foxes typically have a white coat in the winter. In summer, when there is no snow on the ground, the foxes typically have a darker coat. Which of the following is most likely responsible for the seasonal change in coat color?

"Although PTC is not found in nature, the ability to taste it correlates strongly with the ability to taste other bitter substances that do occur naturally, many of which are toxins." Why would knowing if you are a taster or non-taster of PTC be important to survival in the wild? Your answer:

The house finch, Carpodacus mexicanus, is a small bird native to North America that is common in a wide range of habitats including suburban landscapes and cities. These birds are mostly brown and grey, but the face and the breast of the males have bright colors. These bright colors range from yellow, to orange, to deep red, and, finally, to every shade in between. The richness of the color in male house finches depends on their diets. Studies have shown that male house finches who eat seeds rich in a type of pigment called carotenoids have color patches that are deep orange to deep red. Male house finches whose diets are low in carotenoids have color patches that fall in the yellow or pale orange category.      The amount of carotenoids in the diet of house finches is an example of an imcomplete dominance, a bell curve, or an enviormental effect on the phenotype of the finches?   Since there are many possible shades of color that can occur on the feathers of male house…

From the 1700s to the early 1950s there was an unusually high percentage of deaf people on the island of Martha’s Vineyard off the coast of Massachusetts, USA.Deafness was a recessive hereditary trait, and there was a very small population of people living on the island. This meant that almost everyone had both deaf and hearing siblings. In the mid-1850s, the frequency of deaf people on the island was well over 30% higher than the U.S. national average.The high frequency of deaf individuals on the island of Martha’s Vineyard is best explained by Select one: a. genetic drift b. founder effect c. non-random mating d. bottleneck effect