bio diversity

Question 1

what is genetic diversity

Answer 1

Genetic diversity is the number of different alleles of genes in a population.

Question 2

what is a population

Answer 2

a population is a group of individuals of the
same species that live in the same place and can interbreed

Question 3

main steps in natural selection

Answer 3

Random mutations of alleles within this gene pool may result in a new allele of a gene

give its possessor
an advantage over other individuals in the population

individual with the allele are likely to survive and reproduce

increases allele frequency

causing selection pressure

Question 4

what is directional selection

Answer 4

Directional selection is where selection may favour individuals that vary in one direction
from the mean of the population. This changes the characteristics of a population, hence
directional.

Question 5

what is stabilisng selection

Answer 5

Stabilising selection occurs where the environmental conditions remain stable, so the
individuals with phenotypes closest to the mean are favoured.

Question 6

an example of stabilising selction

Answer 6

An example of stabilising selection is human birth weights.
The mortality rate is higher at the extremes of birth weights, as
it seems the optimum masses are between 2.5-4kg. The infants
with higher and lower masses are more likely to die, thus are
being selected against.