D 4.1 natural selection

Harvey Weinberg equation + assumptions

for allel frequency p+q=1

for genome frequency (p+q)²=1

p = dominat allele

q = recesssive allele

assumptions

diploid, cannot be a linked sex gene, sexual reproduction, random mating

the paradise bird case study on sexual slection

male if in good health due to well adapted chracteristsics will have brigter colours and longuer feather, this will suggest to females that he is fit for the enviroment and therfore will be chosen by females to mate

Types of speciations (diagrams)

disruptive speciation: two extremes are favourd middle is selected against

directional selection: one extreme is favored

stabilization speciation: the middle is favored

intraspecific competition (include fitness)

it is the competition within a species; the individual with greater fitness, meaning his chracteristsics are better adapted to the environement will win

overproduction, competition and selection pressure

When a population is too confortable it will produce large amounts of offspring, until the carrying capacity of an environment is achieved, this can be land availability or food, etc this will lead to a decrease in population. However someties, simple selection pressure can be induced by non density dependant factors such as temperature, forest fires, gases, pH all thst is abiotic really