Unit 3-Evolution Of Species

Question 1

Random changes to genetic material that are the only source of new alleles

Answer 1

Mutation

Question 2

Environmental factors that increase the rate of mutation

Answer 2

Radiation OR UV light OR X-rays OR Some chemicals

Question 3

An inherited characteristic that makes an organism well suited to survive in its environment

Answer 3

Adaptation

Question 4

Biological term for a group of organisms that can interbreed and produce fertile offspring

Answer 4

Species

Question 5

Biological term for an organism best adapted to its environment surviving and passing on its favourable alleles to its offspring

Answer 5

Natural Selection

Question 6

Biological term for an organism best adapted to its environment surviving and passing on its favourable alleles to its offspring

Answer 6

Natural Selection OR Survival of the fittest

Question 7

Factors in the environment which make the survival of certain individuals more likely than others

Answer 7

Selective pressures

Question 8

The process by which a new species can arise as a result of the isolation of a part of a population in an environment with different selection pressures

Answer 8

Speciation

Question 9

When part of a species is separated from the rest so that they cannot interbreed for a long period of time

Answer 9

Isolation

Question 10

A reason for different alleles arising in two isolated sub-populations

Answer 10

Mutations

Question 11

Biological term for the gradual change in the genetic make up of a population as a result of natural selection over many generations.

Answer 11

Evolution

Question 12

What results when different selection pressures select for different mutations in two isolated sub-populations over a long period of time?

Answer 12

Two different species