1. PUNETT SQUARE Diagramthat determines the gene combinationsthatmightresultfrom a geneticcross Tt Tt Theletters in thePunnettSquarerepresentalleles; capital lettersrepresentDominantAlleles and lower case letters represente RecessiveAlleles. Mendel’sExperimentspredicted a ratio of 3:1; thisis , 3 dominantto 1 recessive. Thispredictstheaverageoutcome of a largenumber of events. However, probabilitycannotpredictthe precise outcome of an individual event. Thelargerthenumber of offspring, theclosertheresultingnumberswillgettoexpectedvalues.

2. homozygous Organismsthathavetwoidenticalallelesfor a particular trait (TT ortt). Theseorganisms are TRUE-BREEDING forthis particular trait. Organismsthathavetwodifferentallelesforthesametrait (TT ortt). Theseorganisms are HYBRID forthis particular trait. heterozygous Phenotype Physicalcharacteristics of theorganism. Whatwe can see. Genotype Geneticmakeup. Geneticinformation, combination of alleles. Someorganismsmayhavethesame PHENOTYPE, butdifferent GENOTYPE. Forexample, plantswithgenotypes TT, Tt, will look thesame(theywillhavethesamePhenotype).