The interaction of selection and inbreeding in determining the incidence of autosomal recessive diseases. Consider a gene in which recessive mutations occur at a rate of 10^-5. Assume a selective disadvantage S of 0.4 in homozygotes for the recessive allele. Now assume that, for thousands of generations, 10% of all children have been products of first-cousin matings (the remaining 90% being products of random matings). Calculate the steady-state value of q. Also calculate the incidence of the disease at steady state. 

#Question id: 11418

#Unit 10. Ecological Principles

Use the following diagram of five islands formed at around the same time near a particular mainland, as well as MacArthur and Wilson's island equilibrium model principles

Which island would likely have the lowest extinction rate?

#Question id: 11419

#Unit 10. Ecological Principles

There are more species in tropical areas than in places more distant from the equator. This is probably a result of

a) more predators and parasites

b) more dispersed annual solar radiation compared to the poles

c) more frequent ecological disturbances over a longer time span

d) a longer time frame without disturbances for evolution and speciation

#Question id: 11420

#Unit 10. Ecological Principles

We can represent the relationship of species richness to area with the equation

Where S = number of species, and c and z are both constants

Which of the following is not a logical explanation to relationship of species richness to area?

#Question id: 11421

#Unit 10. Ecological Principles

The strength of the island biogeography model was that it generated several falsifiable predictions

A) The number of species should increase with increasing island size.

B) The number of species should decrease with increasing distance of the island from the mainland

C) The number of species on an island might remain the same, but the composition of the species should not be change

Which of the following above statement are correct?

#Question id: 11422

#Unit 10. Ecological Principles

The values of temperature and precipitation used to define climate zones correspond to the conditions of moisture and cold stress that are particularly important determinants of plant form. Which of following is correct combination of Biome?

#Question id: 11423

#Unit 10. Ecological Principles

Our ability to distinguish different biomes under similar conditions in different parts of the world depends primarily on which of the following factors that influence the distributions of growth forms?