Variation

Question 1

Define continous variation

Answer 1

Any value within a range

Eg, height

Question 2

What does Polygenic mean?

Answer 2

When a phenotype is coded for by many different genes at once
Eg, height is determined by the sizes of many different bones

Question 3

What type of selection it is when an extreme phenotype is favoured over others?

Answer 3

Directional selection

Question 4

Define stabilzing selection

Answer 4

When genetic diversity decreases, and the population mean stabilizes

Question 5

How does population size affect allelle frequancy?

Answer 5

The smaller the population the more likely it is for certain allelles and genotypes to be removed completley (become extinct)

Question 6

Define artificial selection

Answer 6

The selection of an allelle that gives a characteristic that is of benefit to humans

Question 7

What is a sterile hybrid?

Answer 7

A mix of two different things , of which their chromosomes do not fit together correctly