Answer:
- A change in genetic variance
Explanation:
Change in genetic variance :
- Polymorphisms : Variation between individuals in a population (within species) .
- Substitutions : Fixed variation between individuals of species (between species)
Natural Selection :
- Those organisms best adapted to their environment have a better chance of surviving and reproducing.
New genetic mutations:
New permanent change in the base sequence of DNA.
Linkage disequilibrium:
- Non-random assortment of allelles at 2 or more loci.
- The closer the markers the stronger the LD , since recombination will have occured at a low rate.
All these conditions interfere with a breeder’s attempt to predict the change in a trait over many generations based on their knowledge of the trait’s heritability.