Which characteristics have been selected and why? There’s 4 reasons

Selectively bred wheat plants.

Learning ObjectivesB2 2.15

Evaluate the evidence that selective breeding (artificial selection) can be used to:

– improve the quality of milk from cattle

– increase the number of offspring in sheep

– increase the yield from dwarf wheat

B2 2.16

Discuss the ethics and health concerns of using growth factors to enhance performance in sport

Paired discussion• Discuss the following in pairs then write a

sentence for each point in your books.

• What was the first domestic cow was used for?• The farmers bred their cows to develop which

characteristics?

• What was the first domestic sheep used for?• How many offspring do sheep have? • What characteristics have been developed in

sheep?

Explain artificial selection.

• RULES:• You cannot use these words or variations of:

– Gene– Select– Characteristic– Breed– Trait

Your explanations will be assessed & marked in this lesson

Peer assessment

• Hand your book with the explanation to someone who sits elsewhere in the room.

• Look at the explanation they have written and mark it.

• Does it explain artificial selection?

• Would a year 8 pupil understand?

• Is it better or worse than yours? Why?

Learning objectives

B2 2.17

Describe the stages in the production of cloned mammals, including Dolly the sheep.

B2 2.14

Discuss why regeneration in animals is relatively rare.

(Spiders, worms, reptiles, sea stars).

Continuum line • How well do you remember the process of

cloning?

• Could you explain the stages of making a clone like Dolly the sheep:

• Easily and completely• With some errors• To communicate the general gist • Not without referring to a book

Regeneration

• What is it and how does it happen?

• Further reading at http://www.scientificamerican.com/article.cfm?id=regrowing-human-limbs