Inheritance And Variation

Question 1

Polydactyly

Answer 1

Caused by a dominant allele - means only 1 parent needs to have it to inherit

Question 2

Cystic fibrosis

Answer 2

Recessive allele - only inherited if 2 copies from parents present

Question 3

What are Fossils

Answer 3

Remains of organisms from 100k years ago found in rocks

Formed from hard parts of animals that do not decay

Conditions for decay are absent

Parts of organisms are replaced by other materials as they decay

PROBLEMS :

Soft bodied very few traces

Traces destroyed by geological activity

Question 4

Selective Breeding

Answer 4

1) Choose parents with desired characteristic

2) Breed together

3) From offspring , choose with desired characteristics and breed

Question 5

Genetic Engineering

Answer 5

1) Desired Gene is cut from another organisms DNA using enzyme

2) Gene inserted into a vector (bacteria)

3) Vector inserts gene into cells of another organism in early development

4) Organism develops with desired characteristic due to cell synthesising that protein