WEEK -3-Basic Genetics, Qualitative Traits and Selection for Qualitative Traits
•There are two basic types of gene action: dominance (recessive) and additive. In the case of dominance, only one copy of the dominant allele in a diploid organism is needed for expression of the associated trait. In the case of the recessive allele, two copies of the allele are needed for the recessive phenotype to be observed.
•Simple Selection Procedures:A dominant allele is very easy to eliminate because every individual fish, each one that has a dominant allele, whether homozygous or heterozygous, expresses its phenotype. Therefore, it is easy to identify and cull individuals with the dominant allele.
