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Transcript
GENOTYPES, PHENOTYPES, AND PUNNETT SQUARES GENOTYPE VS. PHENOTYPE An organism’s genotype is its genetic makeup (allele combination). Ex: TT, Tt, tt An organism’s phenotype is its physical appearance. Ex: TT = Tall, Tt = Tall, tt = short ALLELE COMBINATIONS When it comes to genotypes (allele combinations), there are two types: Homozygous Heterozygous HOMOZYGOUS Homozygous means that the organism only has one type of allele for a trait. (Purebred) Ex: TT, tt, BB, bb HETEROZYGOUS Heterozygous means that the organism has multiple alleles for a trait. Ex: Tt, Bb PUNNETT SQUARES A punnett square is a diagram used to predict the outcome of a breeding experiment. AA a A Aa A Aa a Aa Aa aa TT = Blue Tail OCEAN & LUCY Tt = Blue Tail Ocean tt = Orange Tail (Tt = Heterozygous) T t T TT Tt t Tt tt Lucy (Tt) (Locean) Locean & Sandy Locean (tt = Homozygous Recessive) Sandy (Tt) T t t t Tt Tt tt tt