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TLS Online TPP Program

#Question id: 12960

The Norway rat (Rattus Norvegicus), a widespread pest, was controlled for about a decade by the anticoagulant warfarin. This chemical substance, placed in food pellets, is absorbed by the intestinal tract and inhibits the clotting of blood. After a population decline for about 10 years, rat populations increased and stabilized. In one European population, as illustrated in the graph below, the percentage of rats resistant to warfarin has remained fairly stable over a number of years.

Resistance to warfarin is governed by a dominant autosomal gene, R. More than 15 percent of the resistant animals are heterozygous at this locus (Rr). The table below indicates the response to warfarin and relative reproductive fitness of individuals that are homozygous or heterozygous for the dominant gene (R). The RR individuals have a 20-fold increase in vitamin K requirement over individuals.

Fitness is a measure of the reproductive success of a particular genotype. The highest fitness is 1.00.
Which of the following is most likely correct concerning the gene for resistance to warfarin? 

#Section 5: Applied Ecology & Evolution
  1. It is a wild-type gene induced to mutate by the direct action of warfarin.
  2. It is a mutation subsequently favoured by natural selection. 
  3. It is increased in frequency by virtue of its dominant status.
  4. It is carried by a bacterial plasmid vector.
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TLS Online TPP Program

#Question id: 4705

#Section 2: Evolution

Darwin and Wallace's theory of evolution by natural selection was revolutionary because it ________.
TLS Online TPP Program

#Question id: 9579

#Section 1: Ecology

Allen’s rule states that,
TLS Online TPP Program

#Question id: 8929

#Section 2: Evolution

An obsolete taxon, the ʺRadiata,ʺ included all phyla whose adults had true radial symmetry. Today, the ʺRadiataʺ is more correctly considered to be
1. a clade.
2. a grade.
3. monophyletic.
4. paraphyletic.
5. polyphyletic.
TLS Online TPP Program

#Question id: 16787

#Section 3: Mathematics and Quantitative Ecology

The following observations are arranged in ascending order. The median of the data is 15 find the value of x. 
8, 11, 12, x + 6, 17, 18, 23 
TLS Online TPP Program

#Question id: 16857

#General Aptitude

How …….. you ……… (get) on with your studies?