The evolutionary phenomenon known as reinforcement is most likely to occur when which of the following already exists? a. Prezygotic isolation between two different populations b. Postzygotic isolation between two different populations C. A geographical barrier that separates two populations of the same species d. Gene flow between two separated populations of the same species In some Drosophila species, conditions in the female reproductive tract do not allow the sperm of other species to survive long enough for fertilization to occur. What mechanism of reproductive isolation is in operation in this example? a. Low hybrid viability. b. Mechanical isolation. C. Gametic isolation. d. Temporal isolation,

The evolutionary phenomenon known as reinforcement is most likely to occur when which of the following already exists? a. Prezygotic isolation between two different populations b. Postzygotic isolation between two different populations C. A geographical barrier that separates two populations of the same species d. Gene flow between two separated populations of the same species In some Drosophila species, conditions in the female reproductive tract do not allow the sperm of other species to survive long enough for fertilization to occur. What mechanism of reproductive isolation is in operation in this example? a. Low hybrid viability. b. Mechanical isolation. C. Gametic isolation. d. Temporal isolation,

BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)

10th Edition

ISBN:9781305967359

Author:STARR

Publisher:STARR

Chapter16: Evidence Of Evolution

Section: Chapter Questions

Problem 12SA: A mutation that alters the embryonic expression pattern of an _______ may lead to major differnces...

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2) In some Drosophila species, conditions in the female reproductive tract do not allow the sperm of other species to survive long enough for fertilization to occur. What mechanism of reproductive isolation is in operation in this example? a.Temporal isolation. b.Mechanical isolation. c.Low hybrid viability. d.Gametic isolation.
Pick any trait you like in any species of wild plant or animal. Thetrait must somehow vary among different members of the speciesNote: When picking a trait to answer this question, do not pick the trait of wing color in butterflies.A. Discuss all of the background information that you alreadyhave (from personal observations) regarding this trait.B. Propose a hypothesis that would explain the genetic variationwithin the species. For example, in the case of the butterflies,your hypothesis might be that the dark butterflies survive betterin dark forests and the light butterflies survive better in sunlitfields.C. Describe the experimental steps you would follow to test yourhypothesis.D. Describe the possible data you might collect.E. Interpret your data.
Of the following, which is an example of a postzygotic barrier? O Due to incompatible interactions between inherited genes, a hybrid fetus is unable to develop, and is aborted. O One species mates in spring, while another mates in summer. O A female spider of one species does not respond to the mating display of a male of a closely related species. O Cell surface proteins of one species eggs prevent sperm from another species attaching, so the sperm cannot fertilize it.
Assume you are studying development in two species of iguana. You determine that a certain gene, "SPN2" turns on and off at different times in the two different species. The difference in timing leads to a different body length between the two iguana species. This phenomenon is an example of which of the following terms? a. Punctuated Equilibrium b. Pleiotropy c. Gene duplication d. Heterochrony
In many large mammal populations, highways can be barriers to movement - individuals rarely cross them. One solution to this problem has been to install overhead bridges for wildlife to safely cross. The goal is to increase gene flow between the populations on either side of the highway. Which of the following would you expect to see if the bridge is successful in its goal? O Higher levels of drift would occur after the bridge is installed The two populations would have different mutation rates O Both populations would decrease in size O The two populations would become more genetically similar O We would see fewer heterozygotes in both populations
In a diploid species, each individual possesses (a) one allele for each locus (b) two alleles for each locus (c) three or more alleles for each locus (d) all the alleles found in the gene pool (e) half of the alleles found in the gene pool
A responsible for anterior morphology in an organism is inherited as maternal effect has two allele: H (normal) and h (a recessive allele that cause small head). A female organism with normal head mates with a true-breeding male with small head. All the offspring have small heads. What should be the genotype of mother and offspring? gene. It a. Mother- Hh, and Offspring- hh b. Mother- hh and offspring Hh c. Mother-hh and offspring- hh d. Mother- hh and offspring- Hh
Direction: For each of the five examples below, give the name of the isolating mechanism and specify ifit is prezygotic or postzygotic isolation.a. In some bee population, only large bees are big enough to unfold flower petals and obtain nectarand pollen.b. A cross between two fish species occurs but development only occurs up to 16-cell stage.c. In drosophila, when sperm form one species enters the other species, the sperm is immobilized andunable to fertilized egg.d. Fireflies have a unique lighting pattern. The frequency of lighting is species specific. Fireflies in thesame area will not mate with those having a different lighting frequency.e. Two species of butterflies are found in northern Michigan, but one species is found only near riversand streams, the other near lakes.
For a chi square analysis involving genes that may be linked,which of the following statements is correct?a. An independent assortment hypothesis is not proposedbecause the data usually suggest linkage.b. An independent assortment hypothesis is proposed becauseit allows the expected numbers of offspring to be calculated.c. A large chi square value suggests that the observed andexpected data are in good agreement.d. The null hypothesis is rejected when the chi square value isvery low.
A. Direction: For each of the five examples below, give the name of the isolating mechanism and specify if it is prezygotic or postzygotic isolation. a. In some bee population, only large bees are big enough to unfold flower petals and obtain nectar and pollen. b. A cross between two fish species occurs but development only occurs up to 16-cell stage. c. In drosophila, when sperm form one species enters the other species, the sperm is immobilized and unable to fertilized egg. d. Fireflies have a unique lighting pattern. The frequency of lighting is species specific. Fireflies in the same area will not mate with those having a different lighting frequency. e. Two species of butterflies are found in northern Michigan, but one species is found only near rivers and streams, the other near lakes. B. Read analyze the statements given below. Then, justify your answer. a. A common farming practice is to breed a female horse with a male donkey. The result is a very robust animal – the mule.…
In a population of wild squirrels, most of them have gray fur, butan occasional squirrel is completely white. If we let P and p represent dominant and recessive alleles, respectively, of a genethat encodes an enzyme necessary for pigment formation,which of the following statements do you think is most likely tobe correct?a. The white squirrels are pp, and the p allele is a loss-offunction allele.b. The gray squirrels are pp, and the p allele is a loss-offunction allele.c. The white squirrels are PP, and the P allele is a loss-offunction allele.d. The gray squirrels are PP, and the P allele is a loss-offunction allel
In a complementation cross between Drosophila wiltype(brown eyes). you get a 9:3:3:1 ratio with white eyes being the lowest ratio. what would account for the viabilty of this white mutant strain compared to the brown eyes wild type. additionally why would we see a more robust female population than male population.