Dihybrid Crosses 2019.ppt
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This document describes how to perform a dihybrid Punnett square cross to determine the possible offspring genotypes and phenotypes for two traits. It uses the example of crossing a heterozygous individual for both fur color (B/b) and coat texture (R/r) with another heterozygous individual. The steps involve determining the parental genotypes, writing out the possible gametes, setting up a Punnett square with the gametes, and filling in the possible offspring genotypes. The document then asks how many offspring would have each phenotype. It provides practice examples and worksheets for students to complete.
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Dihybrid Crosses 2019.ppt
- 2. Dihybrid Cross: a cross that shows the possible offspring for two traits Fur Color: B: Black b: White Coat Texture: R: Rough r: Smooth Step 1: FIND OUT THE GENOTYPES OF THE PARENTS In this example, we will cross a heterozygous individual with another heterozygous individual. Their genotypes will be: BbRr x BbRr Trait one Trait Two
- 3. Dihybrid Cross BbRr x BbRr Step 2:FOIL EACH PARENT TO SHOW THE POSSIBLE GAMETE COMBINATIONS Remember, each gamete must have one B and one R. DAD MOM
- 5. F.O.I.L. BbRr BR Br bR br PARENT 1 PARENT 2 BR Br bR br BbRr
- 6. Practice What are the possible gametes for BBrr What are the possible gametes for HhTT?
- 7. Dihybrid Cross BbRr x BbRr DAD MOM Step 3:SET UP PUNNETT SQUARE: Arrange all possible gametes for dad on the top of your Punnett Square, and mom down the side
- 8. Dihybrid Crosses: a cross that shows the possible offspring for two traits Fur Color: B: Black b: White Coat Texture: R: Rough r: Smooth BbRr x BbRr BR bR br bR Br BR br Br Step 4: Fill in the Punnett Square (find the possible genotypes of the offspring) B B B B B B B B b b b b b b b b B B B B B B B B b b b b b b b b R R R R r r r r R R R R r r r r R R R R r r r r R R R R r r r r
- 9. BR bR br bR Br BR br Br BBRR BbRR BbRr BBRr BBrr BbRr Bbrr BbRR BbRr bbRR bbRr BbRr Bbrr bbRr bbrr BBRr How many of the offspring would have a black, rough coat? How many of the offspring would have a black, smooth coat? How many of the offspring would have a white, rough coat? How many of the offspring would have a white, smooth coat? Fur Color: B: Black b: White Coat Texture: R: Rough r: Smooth
- 10. BR bR br bR Br BR br Br BBRR BbRR BbRr BBRr BBrr BbRr Bbrr BbRR BbRr bbRR bbRr BbRr Bbrr bbRr bbrr BBRr How many of the offspring would have black, rough coat? How many of the offspring would have a black, smooth coat? How many of the offspring would have a white, rough coat? How many of the offspring would have a white, smooth coat? Fur Color: B: Black b: White Coat Texture: R: Rough r: Smooth Phenotypic Ratio= 9:3:3:1
- 11. Practice in your notes… In pea plants, yellow seeds (Y) are dominant over green seeds (y), and rounded peas (R) are dominant over wrinkled peas (r). Cross a plant that is heterozygous for both traits with a plant that is homozygous recessive for both traits. Draw a Punnett square to show all possible offspring, and determine the genotypic and phenotypic ratios.
- 12. YyRr X yyrr YR yR yr yr yr yr yr Yr YyRr yyRr yyrr YyRr Yyrr yyRr yyrr YyRr Yyrr yyRr yyrr YyRr Yyrr yyRr yyrr Yyrr
- 13. More Practice • Work on the SpongeBob Dihybrid Cross worksheet. Turn it in at the end of class.