CB4 Evolution and genetics

Question 1

What does evolution of a species mean?

Answer 1

Changes in the appearance / alleles of a species over time.

Question 2

What is an antibiotic?

Answer 2

A substance that kills bacteria, often by damaging their cell walls.

Question 3

What happens to stone tools used by human ancestors over the course of human evolution?

Answer 3

Increase in complexity, sharper blades, smaller size.

Question 4

What are 2 methods for dating fossils?

Answer 4

Recording the layer of rock the fossils were found in, using radioactive minerals.

Question 5

What are the 3 steps of selective breeding?

Answer 5

Select organisms with desirable characteristics, breed the selected organisms, repeat over many generations

Question 6

What are 2 disadvantages of selective breeding?

Answer 6

Reduces genetic variation, inbreeding

Question 7

What is genetic engineering?

Answer 7

Cutting a gene out of one organism’s genome and putting it into another organism

Question 8

What are the 2 main concerns about genetic engineering?

Answer 8

The inserted genes will get out into the environment and we cannot predict the effects of eating genetically engineered crops or livestock