1. What is the hypothesis of Lamarck’s theory?
(1) environmental changes created needs
(2) acquired characters would be passes on to later generations
Note: We now know that it is wrong.
2. What is the theory of natural selection put forward by Charles Darwin?
(1) Organisms that are defeated in competition will die.
(2) Individuals with favourable characters are better adapted to the
environment. They have a higher chance of survival.
(3) The better adapted individuals breed and pass their favourable characters to their offspring.
3. What is stated more in Neo-Darwinism?
Genetic variations can be caused by mutations.
4. State the mechanism of evolution.
(1) Mutation happens in certain individual in a species that causes variation to already exist within species.
(2) When the environment changes, individuals with new characteristics may be more adapted to the environment.
(3) These more adapted individuals will have a higher chance of survival and reproduction.
(4) which after many generation, gradually replace the old species. (i.e. evolution of new species)
5. What is a must criteria for new species to form(speciation)?
(1) Isolation happens between different groups of a population (a group of organism of the same species).
(2) Isolated population will face different environmental conditions leading to the selection of different genetic variations by natural selection. Variations continue to be created and selected such that after many generations, the isolated groups will have such diverse variation that
(3) they can no longer interbreed to produce fertile offspring when two isolated groups come into contact again. Therefore, new species are formed.