Punnett Squares pp. 180-183

Probability: likelihood an event will happen and can be expressed as percentages, fractions, or decimals Monohybrid cross: cross between individuals that looks at one trait Punnett square: diagram to predict the probability of inheritance of certain traits

Place the parent genotypes in: Aa x Aa Match letters and fill in squares Parent I A a A AA Aa Parent II a Aa aa

MENDEL’S RATIOS Genotype ratio- 1BB: 2Bb: 1bb 1:2:1 Phenotype ratio- 3 Black: 1 Brown 3:1

Genotype ratio 2:2 or 1: 1 Phenotype ratio All black

Cross the dominant phenotype with a homozygous recessive (bb) TEST CROSS Cross the dominant phenotype with a homozygous recessive (bb) If you have recessive offspring then the individual must be heterozygous Parent I Parent I b b b b B Bb Bb B Bb Bb Parent II Parent II B b Bb Bb bb bb