Mendel's workplace2-11Fig.2.5
Copyright © The McGraw-Hill Companies, Inc. Permission required to reproduce or display 2-11 Mendel’s workplace s workplace Fig. 2.5
KeystoMendel's success1.He chose an ideal experimental organism, the gardenpea.TransfeDolenwithbrushStigmaAnthers(0)RemovalofanthersOvules（）withinovaryWhitePurple(a)Pisumsativum(b)PeafloweranatomyAllpurple2-12Fig.2.7
Copyright © The McGraw-Hill Companies, Inc. Permission required to reproduce or display 2-12 Keys to Mendel Keys to Mendel’s success s success Fig. 2.7 1. He chose an ideal experimental organism, the garden pea. 1. He chose an ideal experimental organism, the garden pea
2.He examined the inheritance of traits with discrete alternativeforms.Discrete trait: Trait that exhibits a clear either/or status (e.gpurpleversus whiteflowers)RoundorwrinkledripeseedsYelloworgreenseedinteriorsGreenoryellowunripepodsPurpleorwhitepetalsAxialorterminalflowersLongorshortstemsInflatedorpinchedripepods2-13Fig.2.8
Copyright © The McGraw-Hill Companies, Inc. Permission required to reproduce or display 2-13 Fig. 2.8 2. He examined the inheritance of traits with discrete alternati 2. He examined the inheritance of traits with discrete alternative forms. Discrete trait: Trait that exhibits a clear either/or status (e.g. purple versus white flowers)
3.He established pure-breeding lines to conduct his experiments.Pure-breeding lines:Families of organisms that produceoffspring with specific parental traits thatremain constant fromgenerationto generationHe carefully controlled his matings to ensure that the progenyhe observed really resulted from the specificfertilizationsheintended.2-14
Copyright © The McGraw-Hill Companies, Inc. Permission required to reproduce or display 2-14 3. He established 3. He established pure-breeding lines breeding lines to conduct his experiments. to conduct his experiments. Pure-breeding lines: Families of organisms that produce offspring with specific parental traits that remain constant from generation to generation. 4. He carefully controlled his He carefully controlled his matings matings to ensure that the progeny to ensure that the progeny he observed really resulted from the specific fertilizations he he observed really resulted from the specific fertilizations he intended. intended
He worked with large numbers of plants, counted all offspringsubjected his findings to quantitative analysis, and comparedhisresults with predictions.He was a brilliant practical experimentalist.2-15
Copyright © The McGraw-Hill Companies, Inc. Permission required to reproduce or display 2-15 He worked with large numbers of plants, counted all offspring, He worked with large numbers of plants, counted all offspring, subjected his findings to quantitative analysis, and compared subjected his findings to quantitative analysis, and compared his results with predictions. his results with predictions. He was a brilliant practical experimentalist. He was a brilliant practical experimentalist