BIOL 1005 Chapter Notes - Chapter 15: Mutation, Genetic Drift, Genotype Frequency

38 views2 pages

grayelephant515

3 Oct 2015

School

Department

Course

Professor

For unlimited access to Textbook Notes, a Class+ subscription is required.

Document Summary

Adaptation a trait that increases the ability of an individual to survive and reproduce compared to individuals without the trait. Allele frequency for any given gene, the relative proportion of each allele of that gene in a population. Coevolution the evolution of adaptations in two species due to their extensive interactions with one another, such that each species acts as a major force of natural selection on the other. Competition interaction among individuals who attempt to utilize a resource (like food or space) that is limited relative to the demand for that resource. Directional selection a type of natural selection that favors one extreme of a range of phenotypes. Disruptive selection a type of natural selection that favors both extremes of a range of phenotypes. Equilibrium population a population in which allele frequencies and the distribution of genotypes do not change from generation to generation.

Related Questions

Which statement about evolution by natural selection isfalse?

Natural selection allows organisms with higher fitness toreproduce more successfully.

Natural selection favors those traits that confer higherfitness in the environment.

Natural selection is a random change in characteristics of apopulation over generations.

Evolution by natural selection affects populations oforganisms, not individual organisms.

An organism's fitness depends on its _____.

ability to survive and reproduce

ability to swap genetic material with other organisms

physical size

ability to mutate

population

Consider the heavily armored stickleback fish population thatcolonized the lake. If all the individuals in that population weregenetically identical, what do you predict would happen when theycolonized the freshwater lake?

The population would increase, as it has increased foodresources.

The population would evolve through natural selection to bebetter adapted to its environment.

The population would decrease due to more juvenile fish beingeaten.

No answer text provided.

Which of the following are adaptations?

Thicker beaks on finches that allows them to eat large seeds,when large seeds are the most abundant.

Less armor on stickleback fish in freshwater that allows themto grow faster to avoid predation.

More armor on stickleback fish in the ocean that prevents themfrom being eaten by larger predators.

None of the above.

All of the above.

olivemink746

1. Traits don't necessarily have to be passed on from parent to offspring for natural selection to act on them; traits that are environmentally acquired during the life time of an individual (such as practicing to become very strong or very fast) can also be acted upon by natural selection. Select one: True or False

2.Within the same species and even within the same population, not all individuals are the same. They vary in size, shape or other traits.

Select one:

True

False

3.Differential reproductive success means that some individuals in a population leave more offspring that survive and reproduce relative to other individuals in a population.

Select one:

True

False