SB4e Breeds and varieties

Question 1

Natural selection?

Answer 1

individuals inherit characteristics randomly, some of them providing a survival advantage.

Question 2

Artificial selection?

Answer 2

humans can choose organisms with useful characteristics and breed them together.

Question 3

Selective breeding?

Answer 3

when humans choose an organism that has a certain characteristic and then breed more of these organisms, making that chosen characteristic more and more obvious.

Question 4

How could you breed woolly sheep with naturally short tails? (4)

Answer 4

.Select two sheep with naturally short tails
.Breed them together
.Select the offspring with the shortest tails and breed them together
.Repeat for many generations until the tails of the sheep in the population are shorter

Question 5

What some desired characteristics of crops? (5)

Answer 5

.Disease resistance (less likely to be killed or suffer from disease symptoms)​
.Yield (useful product)​
.Ability to cope with environmental change e.g. drought​
.Fast growth
.Good flavour

Question 6

How does genetic engineering work?

Answer 6

it involves changing the DNA of one organism (its genome) by inserting genes from another organism.

Question 7

What are organisms that were produced using genetic engineering called?

Answer 7

genetically modified organisms (GMOs).

Question 8

What is a adv and disadv of genetic engineering? (2)

Answer 8

.faster than artificial selection
.very expensive