#Question id: 12960
#Section 5: Applied Ecology & Evolution
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.
#Question id: 3329
#Section 2: Evolution
The following genotypes of one locus in population are given - Genotype ( Number)
AA (120) AB ( 30) BB (50) CC (300)
AC (400) BC (100)
Which of the following is the correct frequency of C allele and A allele respectively?
#Question id: 9189
#Section 2: Evolution
A plant will recognize a pathogenic invader
#Question id: 11246
#Section 4: Behavioural Ecology
Which of the following are mechanisms that help prey avoid being eaten by predators?
#Question id: 4946
#Section 2: Evolution
Although absolute distinctions between the ʺmost evolvedʺ protobiont and the first living cell are unclear, biologists generally agree that one major difference is that the typical protobiont could not