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Punnett Squares and Heredity Gregor Mendel P Generation F1 Generation Gone Forever? F1 Generation F2 Generation Dominant + Dominant Allele Homozygous Dominant Recessive + Recessive Allele Homozygous Recessive Recessive + Dominant Allele Heterozygous Dominant Dominant + Recessive Allele Heterozygous Dominant F1 Generation: 100% purple even though 1 parent was white F2 Generation Homozygous dominant F1 Generation: 100% purple even though 1 parent was white F2 Generation Heterozygous dominant F1 Generation: 100% purple even though 1 parent was white F2 Generation Heterozygous dominant F1 Generation: 100% purple even though 1 parent was white F2 Generation Homozygous recessive 4 possible gene arrangements Homozygous dominant Heterozygous dominant Heterozygous dominant Homozygous recessive 4 possible gene arrangements Homozygous dominant Heterozygous dominant Heterozygous dominant Homozygous recessive 4 possible gene arrangements Homozygous dominant Heterozygous dominant Heterozygous dominant Homozygous recessive 4 possible gene arrangements Homozygous dominant Heterozygous dominant Heterozygous dominant Homozygous recessive F2 Generation Mathematically Explained! 4 possible gene arrangements Homozygous dominant Heterozygous dominant Heterozygous dominant Homozygous recessive Cross a homozygous dominant yellow (YY) plant with a homozygous recessive green (yy) plant Key Y = yellow y = green Probability of growing a homozygous Probability of growing a yellowrecessive plant? plant? Cross a heterozygous dominant yellow (Yy) plant with a heterozygous dominant yellow (Yy) plant Key Y = Yellow y = green Probability Probability of growing growing a heterozygous plant? Probability ofofgrowing a pure greenyellow? plant? Maria is a heterozygous healthy (Hh) female and Jeff suffers from recessive cystic fibrosis (??). Key H = healthy h = cystic fibrosis Probability of having a healthy child? Probability of eliminating the CF gene from their family? A man and woman are starting a family. The man is homozygous dominant healthy (??) but the woman is a heterozygous carrier (??) of sickle cell disease. Complete a Punnett Square to answer the probability questions. Probabilities? 1)Healthy child? 2)Child who carries the disorder? 3)Same genetic makeup as the mother?
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