Unit 1: Evolution

Question 1

Behavioural Barrier

Answer 1

Barrier to gene flow caused by behavioural difference between individuals.

Question 2

Biological Species

Answer 2

A group of similar organisms interbreeding to produce fertile offspring.

Question 3

Deleterious Sequence

Answer 3

A DNA sequence that lowers survival rates.

Question 4

Directional Sequence

Answer 4

Natural selection that tends to favour an extreme value of a varied characteristic.

Question 5

Ecological Barrier

Answer 5

Barrier to gene flow caused by ecological preference differences between individuals.

Question 6

Evolution

Answer 6

Changes to an organism over time that are mainly caused by natural selection.

Question 7

Genetic Drift

Answer 7

A random change to DNA sequences.

Question 8

Geographical Barrier

Answer 8

A physical barrier to gene flow, such as a mountain or river.

Question 9

Horizontal inheritance

Answer 9

Inheritance of genetic material within a generation.

Question 10

Hybrid Zone

Answer 10

Region in which frequent interbreeding between two species occurs.

Question 11

Natural Selection

Answer 11

Process that ensures survival of the fittest.

Question 12

Sexual Selection

Answer 12

Natural selection of characteristics that increase reproductive success.

Question 13

Speciation

Answer 13

Evolutionary process by which new species are formed.

Question 14

Stabilising Selection

Answer 14

Natural selection that favours a middle value of a varied characteristic.

Question 15

Sympatric Speciation

Answer 15

Speciation in which gene flow is prevented by ecological or reproductive barriers.

Question 16

Vertical Inheritance

Answer 16

Inheritance of genetic material from parents by offspring.

Question 17

Virus

Answer 17

Has genetic material enclosed in a protein coat.

Question 18

Allopatric Speciation

Answer 18

Speciation in which gene flow is prevented by a geographic barrier.