Question

Question #d6f09

Answer 1

Recombinations of existing genetic material and mutations.

Explanation:

hybrids are recombinations of existing genes. Consider the genetic variation possible in the a hybrid cross of an organism with 8 genes

This would be `2^8` gives 256 possible different offspring or variation to choose form ( This is from only one breeding pair)

A organism with 20 genes gives more than 1 million possibilities

Consider the human genome with an estimated 30,000 genes.

This would be `2^(30000)` This number is more than a typical calculator can handle.

National selection has an almost infinite number of possibilities to select from within a species. The variation that is best adapted to the environment will survive and pass on the gene combination that is best suited to the environment. Adaptive evolution is easily observable in nature.

Mutations are also a source of variation. In Malaria regions of the world a harmful mutation of the transfer of an A for a T in the hemoglobin. This causes a disease called cycle cell anemia. The mutation also helps the organism to survive an attack of malaria.
The people with the mutation survive to pass this gene on to their offspring. People with this mutation do better than those without the mutation in Malaria regions, but suffer from the mutation in non malaria regions. All mutations that we know of are a loss of genetic information.