Pre-Test (Week 13)

The symbiotic relationship between birds and large mammals is a clear example of mutualism.

• True

• False

Adaptation is a trait that increases the fitness of its possessor.

• True

• False

Differences between populations may be assumed to be adaptations to their different environments.

• True

• False

A trait may be assumed to be an adaptation if it has long been common knowledge that it is an adaptation.

• True

• False

In general, the hypothesis that a particular trait represents a trade-off implies that the trait is the result of "conflicting" selection pressures.

• True

• Fans

Trade-off is a situtation in which evolution of increased fitness of one trait causes reduced fitness in another trait.

• True

• False

In comparative studies, it is important to be aware of relationships among species because a trait that appears in several closely related species is probably an adaptation.

• True

• False

Phenotypic plasticity is an influence on phenotype by the environment.

• True

• False

Reaction norm is the normal range of possible phenotypes that a given genotype may produce under different environmental conditions.

• True

• False

Not every trait is an adaptation.

• True

• False