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unit d b30

David Nguyen 80 preguntas

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Preguntas del test (80)

  1. 1Polydactylism in Humans

    In a population of humans, the gene for number of fingers has two forms. Individuals with the dominant form of this gene have six fingers. Individuals with the recessive form of the gene have five fingers. In one generation, the frequency of recessive alleles was found to be 0.0021. In the next generation, the frequency of the recessive alleles was also 0.0021.

    According to the conditions of the Hardy-Weinberg principle, the frequency of the recessive alleles from one generation to the next indicates that
    1. Athe population sampled must have been very large
    2. Bnew mutations of the dominant form of the gene were appearing in the population
    3. Cpeople with polydactylism tend to mate with other people with polydactylism
    4. Dthere was a considerable immigration of people into the population sampled.
  2. 2Lizards
    On a small (1.4 km2) island in the Pacific Ocean, a researcher noticed two forms of a lizard. One form was light grey and the other was black. The total population of the species was always around 150 individuals. Over a period of 5 years, the number of black lizards increased from 12 to 54 individuals.

    The most probable cause of the increase in the number of black lizards is
    1. Arandom mating of the lizards
    2. Bgenetic equilibrium.
    3. Cnatural selection in favour of the black form.
    4. Dimmigration of black lizards from another island
  3. 3Butterflies
    On a small island off the coast of England, most of a population of butterflies had six spots on the hind wing year after year. There were a few butterflies in the population with five spots, and even a few individuals with four spots on their hind wing. The population was sampled annually and routinely had a size of well over 1000 individuals. However, something happened to the population one year, and only one individual butterfly from this population could be found. The next year butterflies of this population were once again abundant, but now most of the individuals in the population had only four spots on their hind wing.

    The change in the number of wing spots in this population of butterflies is an example of
    1. Anon-random mating in the population
    2. BHardy-Weinberg equilibrium
    3. Cthe bottleneck effect
    4. Dnatural selection
  4. 4Natural selection is the only process that leads directly to
    1. AHardy-Weinberg equilibrium
    2. Bevolutionary adaptation
    3. Csexual adaptation
    4. Dthe founder effect
  5. 5Natural selection occurs when
    1. Aindividuals change in response to a changing environment
    2. Bthere is genetic variation in a population and the environment can support more individuals than are born
    3. Cthere is genetic variation in a population and the environment is changing
    4. Dmore individuals are born than can survive in an environment that is not changing
  6. 6The population that would most likely exhibit the effects of genetic drift is one with a population size of


    47 individuals


    15 000 individuals
    1. A47 individuals
    2. B15 000 individuals
    3. C250 individuals
    4. D200 individuals
  7. 7The population most likely to be in genetic equilibrium is
    1. Aa medium-sized population of birds where females select mates on the basis of male size.
    2. Ba large population of birds that is isolated from other populations of the same species by a mountain range
    3. Ca large population of birds in close contact with other populations of the same species
    4. Da small population of birds on an island.
  8. 8Which row below would indicate the species most likely to have experienced genetic change due to the bottleneck effect?
    1. AIn 1999, one thousand cow-calf pairs roamed the foothills on a ranch in southern Alberta.
    2. BBanff had a robust elk population numbering in the thousands in 2004.
    3. CIn 2006, the population of coyotes in Calgary was estimated at 600 individuals.
    4. DIn 1938, only 14 adult whooping cranes (Grus americana) survived.
  9. 9Use this table to answer the next four questions.
    Population Population size (N) Recessive allele frequency in different generations
    A 23 0.234 -> 0.179 -> 0.112
    B 147 0.337 -> 0.335 -> 0.351
    C 9085 0.540 -> 0.541 -> 0.540
    D 12960 0.348 -> 0.356 -> 0.401
    The population in the chart that is most likely experiencing genetic drift is the population labelled
    1. AA
    2. BB
    3. CC
    4. DD
  10. 10The population most likely to be experiencing genetic equilibrium is population
    1. AA
    2. BB
    3. CC
    4. DD

Información

Descripción
Test sobre unit d b30, creado por David Nguyen el 21/03/2024.
Idioma
English
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Etiquetas
grade 12
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