Nerodia sipedon insularum is a species of the Northern Water Snake that lives on islands in the western part of Lake Erie. This snake exhibits polymorphism (many color forms) and can be described as Banded (BB), intermediate (Bb) and unbanded (bb). The mainland populations of this snake are all banded. The islands have sandy shores which the snakes reside compared to rocky shores of the mainland. In 1980-1984, Richard King conducted a study of mark recapture to look at the numbers of each of these morphs of snakes and for the Island of Pelee this was the population size: Banded: 71 individuals; Intermediate: 80 individuals; Unbanded 20 individuals. Give the genotypic frequencies for each morph and then give the allele frequencies for this population.

Nerodia sipedon insularum is a species of the Northern Water Snake that lives on islands in the western part of Lake Erie. This snake exhibits polymorphism (many color forms) and can be described as Banded (BB), intermediate (Bb) and unbanded (bb). The mainland populations of this snake are all banded. The islands have sandy shores which the snakes reside compared to rocky shores of the mainland. In 1980-1984, Richard King conducted a study of mark recapture to look at the numbers of each of these morphs of snakes and for the Island of Pelee this was the population size: Banded: 71 individuals; Intermediate: 80 individuals; Unbanded 20 individuals. Give the genotypic frequencies for each morph and then give the allele frequencies for this population.

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter22: Speciation

Section: Chapter Questions

Problem 1ITD: David Hills of Baylor University noted that three closely related species of leopard frog (genus...

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In the 1960s, a population of squirrels (Sciurus carolensis) was being studied in Alabama and the coat color of the squirrels was found to range from the more common gray color (dominant) to the less common red color (recessive). When they sampled an area, they found 536 gray squirrels and 64 red squirrels. Assume that the population is at Hardy-Weinberg equilibrium. 1A. Show your work to find the frequency of the homozygous recessive individuals.
David Hills of Baylor University noted that three closely related species of leopard frog (genus Rana) exhibit substantialbut not completepostzygotic reproductive isolation when crossed in the laboratory. Field surveys of numerous populations in Texas and surrounding states revealed that populations of the three species breed at various times during the year. Data on the breeding schedule of both allopatric and sympatric populations of these species are presented in the Figure below. Interpret the data in the figure and explain how they may demonstrate that these frogs experience prezygotic reproductive isolation in nature. What type of prezygotic reproductive isolation do the data suggest? Source: D.M. Hillis. 1981. Premating isolating mechanisms among three species of the Rana pipiens complex in Texas and southern Oklahoma. Copeia 1981:312-319.
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