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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: 10696

#Section 1: Ecology

In a new area two species A and B was discovered and taking energy from another species X and Y respectively. Following some is life history trait of species.

I- A species is often larger than X

II- Each A species taking energy from many X

III- One Y usually supports populations of B species

IV- Fatality of Y is Mild to severe

Which of the following is correct observation of above species?
TLS Online TPP Program

#Question id: 11503

#Section 2: Evolution

Which process allowed the nucleomorphs of chlorarachniophytes to be first reduced, and then (in a few species) lost altogether, without the loss of any genetic information?
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#Question id: 10594

#Section 2: Evolution

Which of the following is not characteristic of ruderal species?
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#Question id: 16804

#Section 4: Behavioural Ecology

Which of the following is a symptom of altitude sickness?
TLS Online TPP Program

#Question id: 4932

#Section 2: Evolution

Which of the following is the best hypothesis regarding origins of nucleic acids?