rgins of species!!!
A specie is a group of individuals that reseamble one another, mate freely in nauture and produce fertile offspring.
So how do i become a specie?
There are 6 different barriers that may be obstacles and may prevent mating or inability to fertilize if mating occurs. Here they are:
- Habitat isolation- you live in different places
- temporal isolation- reproduce at different times
- behavioral isolation- you act differently
- mechanically- If your genitals are not compatible.
- gametic- if your sperm and egg are not compatible
Post-Reproduction
- reproduced hybrid viability- the babies dont survive
- Reduced hybrid fertitlity- your babies cant have babies
- hybrid breakdown- the kids of your kids cant have babies.
if none of these happen to you, then you are a specie!
FIRST OF ALL!
Darwin DID NOT come up with the idea of evolution.
Darwin came up with evolution by natural selection.
LAMARCK!
he said that genes can be influenced by environmental conditions.
Darwin said that evolution occured with natural selection- meaning there will be variety and that it is survival of the fittest.
It will only occur in the worse conditions.
Darwin -
There are 3 types of selective pressures
- stabilizing - for example the Hardy-Weinberg equilibrium. 50- 50.
- Directional- higher concentration on one side.
- Diversifying- makes 2 different species. there is no mixture.
No comments:
Post a Comment