Genetic diversity

Question 1

Genetic diversity definition

Answer 1

The number of different alleles of genes in a population

Question 2

GD

Answer 2

allows nature selection to occur

greater= more likely to survive env change

Wider range of alleles
wide range of charateristics
greater probability that an individual will posses a characteristic that suits it to the new conditions

Question 3

Increase GD

Answer 3

Greater alleles
increase survival

Question 4

within population increasing genetic diversity by

Answer 4

Genetic mutations - new alleles

New alleles introduced to population - reproduced

Meiosis

Random fertilisation of gametes - sexual reproduction

Question 5

Why does the frequency of this trait increase in population

Answer 5

trait X has a genetic basis

Random mutation = genetic diversity

How advanatage and type of selection

individuals with allele more likely to survivie, reproduce and pass on allele to offspring

Over many generations the frequency of alleles increases in population and so does the trait

Question 6

Natural selection steps

Answer 6

random mutation can result in new alleles of a gene

Many mutations harmful but in same env, new alleles can be beneficial

advantageous allies are inherited by members of the next generation

As a result over many generations, the new allele increases in frequency in the population

• must occcur in gametes

Question 7

Directional selection

Answer 7

When individuals with alleles for charaterterists of an extreme type are more likely to survive and reproduce

• antibiotic resistance

Question 8

Stabilsing selection

Answer 8

When individuals with allele for characterisitcs towards the middle range are more likely to survive and reproduce

human birth rate

Question 9

Disruptive selection