B2.5 Variation & Selection Flashcards
List 4 characteristics of continued variation
No distinct categories
Tends to be quantative
Controlled by lots of genes
Heavily influenced by the environment
List 4 characteristics of discontinuous variation
Distinct categories
Tends to be qualative
Controlled by few genes
Unaffected by the environment
Give 2 examples of our genes
Blood group and eye colour
Give 2 examples of our environment (Bio)
Weight and height
Where do different species show variation?
Phenotypes
What do individuals compete for and what happens id they are the best adapted?
They compete for recourses and if they’re adapted they have a better chance of survival
What happens to the surving individual?
They reproduce
What happens to the beneficial gene?
It is passed on to their offspring
What may cause extinction?
Inability to adapt to the environment quickly
What happens to bacteria that are resistant to antibiotics? (What does it do and make?)
They reproduce and create more resistant bacteria
When something is being bred, what attributes are typically thought after?
Appearance
Resistance to Bacteria
Long Shelf Life
Taste
