A.) Toward the end of the 19th century, American bison (Bison bison) were over hunted by the U.S. Government and professional hunters to eliminate a central foodstuff of the indigenous peoples, so that by 1900 only 300 American bison were left. The remaining population likely experienced which of the following:
a. Genetic drift.
b. Genetic equilibrium
c. Natural selection.
d. Heterozygous advantage.
B.) The resurrection fern (Pleopeltis polypodioides) grows on the bark of southern live oak trees (Quercus virginiana). Resurrection ferns that grow on the underside of branches receive less water than those growing on the topside and, therefore, have a fitness of only 0.28. How many of these ferns will be non-reproducing?
a. 80%
b. 52%
c. 28%
d. 72%
C.) Pine snakes (Pituophis melanoleucus) live in the central Louisiana pine savannahs, where lightning strikes and fires are common. Pine snakes have evolved two types of fire avoidance behavior: slither away and dive-in-gopher-hole. If the dominant allele (D) causes the dive-in-gopher-hole behavior and if 25% of pine snakes slither away, what would be the frequency of the dominant allele? Assume the population is in genetic equilibrium.
a. 0.75
b. 0.25
c. 0.5
d. .5
D.) Bombardier beetles (Carabidae) produce a controlled explosion by mixing hydrogen peroxide with hydroquinone to form a boiling, foul smelling liquid that can be sprayed at predators. If this trait is encoded by the dominant allele of a single gene with two variants, then how would you calculate the frequency of beetles capable of producing this explosion? Assume the population is in genetic equilibrium. (p = frequency of dominant allele; q = frequency of recessive allele)
a. p2
b. p + q
c. p2 + 2pq
d. p2 + q2
Ans A) The remaining Bison population likely experienced Genetic drift. So, option-a is correct.
Explanation:
Over hunting of the American Bison resulted in Bottleneck effect. Bottleneck effect occurs when a population is reduced to a smaller sub population and the remaining individuals do not represent the total genetic diversity.
Bottleneck effect is a type of genetic drift.So, option-a is correct.
A.) Toward the end of the 19th century, American bison (Bison bison) were over hunted by...
Pine snakes (Pituophis melanoleucus) live in the central Louisiana pine savannahs, where lightning strikes and fires are common. Pine snakes have evolved two types of fire avoidance behavior: slither away and dive-in-gopher-hole. If the dominant allele (D) causes the dive-in-gopher-hole behavior and if 25% of pine snakes slither away, what would be the frequency of the dominant allele? Assume the population is in genetic equilibrium. Select one: a. .5 b. 0.5 c. 0.75 d. 0.25