#Question id: 10629
#Section 1: Ecology
Following are density dependent factors
A- Food B- space
Which of the following animal and their most important density dependent limiting factor are correct?
#Question id: 8289
#Section 2: Evolution
The term convergent evolution is most applicable to which of the following features?
#Question id: 16831
#General Aptitude
#Question id: 10243
#Section 1: Ecology
A group of species that potentially compete with one other for a resource, such as insect- eating birds, is called a
#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.