Happy Thursday! 5 mins to finish up & turn in the “meiosis simulation” (make a baby) from yesterday If you’ve finished, read page __________ in the text book on dihybrid crosses Pick up a sheet of notes from the front

STEP #1: Record the alleles and the traits they encode. Blue beetle color = ____ Green beetle color = ____ Polka dot pattern = ____ No polka dot pattern = ____

STEP #2: Write the parents’ genotypes. ____ ____ ____ ____ X ____ ____ ____ ____

STEP #3: Determine the 4 possible gametes for each parent. Use distribution property from math class! Alleles for the same trait must separate (Mendel’s Law of Segregation). Parent 1: BbPp Parent 2: bbpp

STEP #4: Write possible gametes along the top and side of a 4x4 Punnett square.

STEP #5: Fill in your Punnett square STEP #5: Fill in your Punnett square. Put alleles of the same trait together, with dominant before recessive.

STEP #6: Write the 4 possible phenotypes, then count them using shapes.

STEP #7: Write the phenotypic ratio (not genotypic).