Mendel studied discrete, qualitative traits in peas. this organism him induce the rules of inheritance. his work dealt with simple dominant/recessive relationships between alleles. however, expression of many traits are not governed by a single gene, rather can involve multiple genes as well as additive effects. this kind of inheritance pattern is known as quantitative (see cogbooks -> genetic analysis of populations for more information). edward m east (1916) studied a continuously varying phenotype characteristic in nicotiana longiflora. he took pure-breeding lines of n. longiflora growing long corollas and crossed them with pure-breeding lines growing short corollas. after crossing these lines, f1 offspring had an intermediate length for corolla and had same variation level as in parents. but found a very different result for f2 and f3 than expected. discuss the reasons for this result and if it agrees/disagrees with mendel’s law. using obtained knowledge so far, what kind of cumulative effects would you add to this variation