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Transcript
PUNNETT SQUARE GUIDELINES 1.First read the problem. 2.Draw the square with a ruler & add eggs & sperm to sides. 3.Make a key for dominant & recessive genes. 4.Neatly place letters in eggs (top) & sperm(side). NOTE: If no sex is given the first description is given to the female and the second to the male. NOTE: Always place the capital letter first. 5.Carry out the cross 6.Then answer genotype & phenotype questions. REMEMBER: Genotype: refers to the genes/letters Phenotype: refers to the appearance/what the offspring looks like. EX: Black hair is dominant. A purebred black haired cat is crossed with a hybrid male who also carries a gene for white hair. BB Bb bb genotype:1/2 BB, 1/2 Bb phenotype: all have black hair Peggy Lenz