9000707
Descripción
Test por Eilidh Young, actualizado hace más de 1 año
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Creado por Eilidh Young
hace más de 7 años
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Pregunta 1
Pregunta
Which of these is NOT true in regards to Neo-Darwinism?
Respuesta
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Ample genetic variation arises and is contained in populations.
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Evolution in populations is influenced by natural selection and is characterised by changes in gene frequencies.
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Adaptive genetic variation produces small stepwise changes in phenotypes, which accumulate gradually over long periods of time.
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The divergence of geographical isolated populations is unimpeded and gradually leads to speciation.
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The gradual accumulation of genetic differences, via natural selection, results in new genera and families of organisms (macroevolution).
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This hypothesis predicts that over generations a freely mating population will give rise to a uniform population of individuals.
Pregunta 2
Pregunta
What term are these definitions defining?
[blank_start]Evolution[blank_end] – changes in allele frequencies in a
population.
[blank_start]Population[blank_end] – a group of individuals of the same
species that live in the same area and interbreed.
[blank_start]Gene pool[blank_end] – is the sum of all the alleles of all genes
of all individuals in the population.
Respuesta
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Evolution
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Population
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Gene pool
Pregunta 3
Pregunta
If only one allele exists at a particular locus or gene in
a population, the allele is said to be fixed.
Respuesta
- True
- False
Pregunta 4
Pregunta
If there are two or more alleles for a gene in a
population, individuals will be either homozygous or
heterozygous.
Respuesta
- True
- False
Pregunta 5
Pregunta
Which of these are TRUE, with respect to the Hardy-Weinberg Equilibrium?
Respuesta
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Population genetics defines evolution as changes in allele frequencies.
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In a population that is not evolving, allele and genotype frequencies will remain constant from one generation to the next.
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A non-changing population is said to be in Hardy-Weinberg equilibrium.
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The Hardy-Weinberg equation allows us to calculate the expected genotype frequencies given the observed allele frequencies.
Pregunta 6
Pregunta
Match the condition for Hardy-Weinberg equilibrium with its definition.
1. [blank_start]No mutations[blank_end]. The gene pool is modified if mutations change alleles.
2. [blank_start]Mating occurs at random[blank_end]. If individuals mate with a subset of the population, genotype frequencies change.
3. [blank_start]No natural selection[blank_end]. Differences in survival and reproduction of individuals with different genotypes can alter allele frequencies.
4. [blank_start]Extremely large population size[blank_end]. The smaller the population, the more likely that allele frequencies will fluctuate by change.
5. [blank_start]No gene flow[blank_end]. Movement of individuals (alleles) in and out of a population can alter allele frequencies.
Respuesta
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No mutations
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Mating occurs at random
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No natural selection
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Extremely large population size
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No gene flow
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No genetic variation
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