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 ID: 760728
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Slide1
Happy Thursday!
5 mins to finish up & turn in the “meiosis simulation” (make a baby) from yesterdayIf you’ve finished, read page __________ in the text book on dihybrid crossesPick up a sheet of notes from the front
Slide2STEP #1: Record the alleles and the traits they encode.
Blue beetle color
= ____
Green beetle color
=
____
Polka dot pattern =
____
No polka dot pattern
= ____
Slide3STEP #2: Write the parents’ genotypes.
____ ____ ____ ____ X ____ ____ ____ ____
Slide4STEP #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
Slide5STEP #4: Write possible gametes along the top and side of a 4x4 Punnett square.
Slide6STEP #5: Fill in your Punnett square. Put alleles of the same trait together, with dominant before recessive.
Slide7STEP #6: Write the 4 possible phenotypes, then count them using shapes.
Slide8STEP #7: Write the phenotypic ratio (not genotypic).