A possible example of concept is bird feathers: although obviously valuable for flight, it has been suggested that they were originally an adaptation for insulation

Adaptations in nature are not perfect, for various reasons. Give atleast one reason

Is perfect adaptation possible?

It produces a distortion in normal Mendelian segregation, so that chromosomes bearing this gene are over-represented in an organism's offspring.

Group selection, in which selection produces adaptations for the benefit of groups of unrelated individuals, is thought to be a weak force.

Adaptations evolve because they increase the replication of genes. (T/F)

In biology, what is the basic level of organization?

Does natural selection ever favor groups, rather than individuals?

What are the three theories have been put forward to explain the existence of adaptation?

True or False. The discussion of units of selection aims to find out which level natural selection directly acts on, and which ones it affects only incidentally.

What form of adaptation does this Papilio butterfly shows?

A plant, for example, may be more likely to mutate to a new form with more branches than would a vertebrate because it is easier to produce that kind of change in the development of a plant. What type of constraint is this?

In organisms like humans, with separate germ and somatic cell lines, selection between cell lines is a strong force. (T/F)