Mendel studied discrete, qualitative traits in peas. Thisorganism helped him induce the rules of inheritance. His work dealtwith simple dominant/recessive relationships between alleles.However, expression of many traits are not governed by a singlegene, rather can involve multiple genes as well as additiveeffects. This kind of inheritance pattern is known as quantitative(See Cogbooks -> Genetic analysis of populations for moreinformation). Edward M East (1916) studied a continuously varyingphenotype characteristic in Nicotiana longiflora. He tookpure-breeding lines of N. longiflora growing long corollasand crossed them with pure-breeding lines growing short corollas.After crossing these lines, F1 offspring had an intermediate lengthfor corolla and had same variation level as in parents. But found avery different result for F2 and F3 than expected.
Discuss the reasons for this result and if it agrees/disagreeswith Mendelâs law. Using obtained knowledge so far, what kind ofcumulative effects would you add to this variation?
Mendel studied discrete, qualitative traits in peas. Thisorganism helped him induce the rules of inheritance. His work dealtwith simple dominant/recessive relationships between alleles.However, expression of many traits are not governed by a singlegene, rather can involve multiple genes as well as additiveeffects. This kind of inheritance pattern is known as quantitative(See Cogbooks -> Genetic analysis of populations for moreinformation). Edward M East (1916) studied a continuously varyingphenotype characteristic in Nicotiana longiflora. He tookpure-breeding lines of N. longiflora growing long corollasand crossed them with pure-breeding lines growing short corollas.After crossing these lines, F1 offspring had an intermediate lengthfor corolla and had same variation level as in parents. But found avery different result for F2 and F3 than expected.
Discuss the reasons for this result and if it agrees/disagreeswith Mendelâs law. Using obtained knowledge so far, what kind ofcumulative effects would you add to this variation?
