Which of the following is likely to be most important in the evolution of two species from one population of another species? O some kind of barrier that physically divides the original species into two sub-populations O a change in the environment such that one sub-population experiences differential natural selection O reduced performance of gametes (e.g., pollen) in crosses between sub-populations O reduced fitness of offspring resulting from crosses between sub-populations genetic divergence and cessation of gene flow between sub-populations

Which of the following is likely to be most important in the evolution of two species from one population of another species? O some kind of barrier that physically divides the original species into two sub-populations O a change in the environment such that one sub-population experiences differential natural selection O reduced performance of gametes (e.g., pollen) in crosses between sub-populations O reduced fitness of offspring resulting from crosses between sub-populations genetic divergence and cessation of gene flow between sub-populations

Biology 2e

2nd Edition

ISBN:9781947172517

Author:Matthew Douglas, Jung Choi, Mary Ann Clark

Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark

Chapter19: The Evolution Of Populations

Section: Chapter Questions

Problem 1VCQ: Figure 19.2 In plants, violet flower color (V) is dominant over white (v). If p = .8 and q = 0.2 in...

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The bination of genes during reproduction in an important step in the evolutionary process What effect does the recombination of genetic material have on a population of organioms? O Recombination increasses the ability of all offspring to survive in a stable environment O Recombinalion decreases the genetic variation of a population which helps maintain a stable population O Recombination decreases the chance of producing offspring that are able to adapt to the new environment. O Racombination increases the genetic variation of the population that enables a species to adapt to change.
Natural Selection is defined as the differential survival and reproduction of individuals due to differences in phenotype. What two features of a population are required for Natural Selection to function? Binary fission Asexual reproduction Genetic variation Overproduction of progeny Homeostasis Interbreeding of progeny Recombination O Co-dominant phenotypes
In a population of lizards, color is genetically determined. The current population has two two phenotypes: blue and yellow. Which of the following scenarios could result in evolution by migration? O A disease indiscriminately reduces the population by 90%. Birds are better able to see and therefor prey on blue lizards The population is joined by individuals from a nearby population that has an allele for a red phenotype. Females preferentially mate with individuals exhibiting the blue phenotype.
180- 170- Figure 1. For each of more than 200 human societies, the average height of the men is plotted against the average height of the women. The diagonal line shows where the points would fall if men and women were of equal height. From Rogers and Mukherjee (1992). 160- 150- 140- 140 150 160 170 180 Female stature (cm) tionry ysin.e 2. Using an evolutionary approach, explain the evolution of sexual dimorphism in height among men and women, Is this difference due to natural or sexual selection? How do know? you Male stature (cm)
As genomes become sequenced it has become evident that genes become duplicated as a mechanism of evolution. In some cases, recently duplicated genes perform identical functions. Suppose genes R and S are of unlinked genes that in fact arose recently from such a gene duplication event. If two Rr Ss individuals are mated, what would be the phenotypic ratio of their progeny. Assume r is recessive to R and s is recessive to S. 9:7 1:2:1:2:4:2:1:2:1 12:3:1 9:3:3:1 15:1
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Color blindness in humans is caused by an X-linked recessive allele. Ten percent of the males of a large andrandomly mating population are color-blind. A representative group of 1000 people from this population migrates to a South Pacific island, where there are already1000 inhabitants and where 30 percent of the males arecolor-blind. Assuming that Hardy–Weinberg equilibrium applies throughout (in the two original populationsbefore the migration and in the mixed population immediately after the migration), what fraction of malesand females can be expected to be color-blind in the generation immediately after the arrival of the migrants?
n your own words, explain the factors that lead to the Phenotypic variation andits importance to evolution. explain thoroughly
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Hardy-Welnberg Equilibrlum Scenarlo In a population of beetles, the dominant shell coior is black whlie the recessive shell color is brown. There are only two observed variations and black shels are betieved to be completely dominant to brown shells (following Mendellan genetics ruies). The beetles are an endangered species, so the zoo where they ive keeps a very close count on the population in hopes of returning them to the wild someday. The total number of beetles in the exthitat is 1,387 956 beetles are black Using the information provided above, what is the frequency of homozygous dominant individuals? 6 points O Approximately 19% of the beetles. O Approximately 31% of the beetles. O Approximately 49% of the beetles. O Approximately 69% of the beetles. Using the information provided above, what is the frequency of
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