Selective Breeding

Question 1

Define selective breeding

Answer 1

Selecting certain desirable alleles that code for the traits that we want in order to produce an organism that is more valuable to use

Question 2

Name 3 advantages to selective breeding

Answer 2

1) Animals can be selectivel bred to not cause harm ie. a bull with no horns
2) New varieties may e economically valuable by producing more or better quality food
3) Organisms can be bred specifically to complete a type of work or process

Question 3

Name 3 disadvantages of selective breeding

Answer 3

Reduces the gene pool of the population, increasing the organisms vulnerability to new diseases
Increased chamce of organisms inheriting harmful genetic defects
Animal discomfort occurs if an animal is bred being too fat for meat or too large udders

Question 4

Describe how selective breeding can develop plants with desired characteristics

Answer 4

Plant species with desired characteristics are chosen to cross-pollinate and reproduce
As a result, the gene for a desired characteristic is passed onto offspring
Offspring that best expresses desired characteristic is chosen and selective breeding process is repeated

Question 5

give 3 examples of desired traits in plants

Answer 5

Large fruit
Lots of flavour
Disease resistance
Large yeild of crops

Question 6

Give 3 examples of desired traits in animals

Answer 6

Produce large quantities of meat/milk
Chickens that lay large eggs
Docile behaviour in domestic animals

Question 7

How does selective breeding produce animals with desired characteristics?

Answer 7

Choose the best offspring with the desired characteristics to produce the next generation. Repeat the process continuously over many generations, until all offspring show the desired characteristics.