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Punnet squares

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  • 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).