Evolution- Data Test

Evolution

A change in the genetic composition of a population during successive generations, which may result in the development of new species.

Overproduction

Overproduction is when each generation has more offspring than can be supported by the environment

Competition

It is an interaction between species or organisms in which both require a resource which is of limited supply.

Variation

Is the difference between individuals of the same species, caused by genetic and environmental factors.

Adaptation

The evolutionary process whereby an organism becomes better able to live in its habitat or habitats

Selection Pressure

External agents which affect an organism’s ability to survive in a given environment

Species

A group of organisms that can reproduce with one another in nature and produce fertile offspring.

Population

A population is a group of organisms, all of the same species, that live in a specific area.

Speciation

How a new kind of plant or animal species is created.

Reproductive Isolation

The inability of a species to breed sucessfully with related species due to geographical, behavioural, physiological, or genetic barriers or differences.

Gene Flow

Any movement of individuals and/or the genetic material they carry, from one population to another.

Extinction

The dying out or extermination of a species

Resistance

The capacity of bacteria to withstand the effects of a harmful chemical agent

Relative Dating

Uses index fossils (widespread but short lived fossils) by a process called biostratigraphy or correlation (this involves matching of fossils from one location to those from another. This process uses two assumptions; layers that contain the same fossil were formed at the same time in history and the lower rock layers contain older fossils than upper rock layers.

Half Life

the time it takes for half the quantity of an isotope to decay

What are T-tests used to compare?

two sets of data for significant difference (if p value less than 0.05 data sets are different and not due to chance).

What does overlapping error bars indicate?

no significant difference between data