Mendelian inheritance in human is gained by analysis of family pedigrees or the results of matings that have already occured. We may be able to predict how the trait is inherited by analysing a pedigree.
It acts as visual tool for documenting the biological relationship in families and to determine the mode of inheritance (dominant, recessive etc.) related to genetic disease. Whereas quantitative trait polygenic trait and material traits are not studied by pedigree analysis. Continous traits are often measured and given a quantitative value, they are a often referred as quantitative traits, e.g. crop yield weight gain in animals IQ, etc.
Polygenic traits are another exception to Mendel's rule, which occurs when a traits is controlled by more than one gene. This means that each dominant allele adds to the expression of the next dominant allele.
The traits inherited and expressed from the maternal parent to the subsequent offsprings are maternal traits.