Punnet squares

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Punnet squares

  1. 1. PUNETT SQUARE<br />Diagramthat determines the gene combinationsthatmightresultfrom a geneticcross<br />Tt<br />Tt<br />Theletters in thePunnettSquarerepresentalleles; capital lettersrepresentDominantAlleles and lower case letters represente RecessiveAlleles.<br />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.<br />
  2. 2. homozygous<br />Organismsthathavetwoidenticalallelesfor a particular trait (TT ortt).<br />Theseorganisms are TRUE-BREEDING forthis particular trait.<br />Organismsthathavetwodifferentallelesforthesametrait (TT ortt).<br />Theseorganisms are HYBRID forthis particular trait.<br />heterozygous<br />Phenotype<br />Physicalcharacteristics of theorganism.<br />Whatwe can see.<br />Genotype<br />Geneticmakeup.<br />Geneticinformation, combination of alleles.<br />Someorganismsmayhavethesame PHENOTYPE, butdifferent GENOTYPE. <br />Forexample, plantswithgenotypes TT, Tt, will look thesame(theywillhavethesamePhenotype).<br />

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