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Copyright © 2006 Pearson Prentice Hall, Inc. Dihybrid cross Complete dominance.

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Presentation on theme: "Copyright © 2006 Pearson Prentice Hall, Inc. Dihybrid cross Complete dominance."— Presentation transcript:

1 Copyright © 2006 Pearson Prentice Hall, Inc. Dihybrid cross Complete dominance

2 Example: Coat color and Polled/horned condition in cattle Black coat (B) is dominant over red coat (b) Polled (no horns) condition (P) is dominant over horned condition (p)

3 Cross two individuals who are heterozygous for both traits: BbPp X BbPp Both individuals have black coats and are polled

4 AllelesBPBpbPbp BP Bp bP bp BbPp X BbPp

5 BPBpbPbp BPBBPPBBPpBbPPBbPp BpBBPpBBppBbPpBbpp bPBbPPBbPpbbPPbbPp bpBbPpBbppbbPpbbpp BbPp X BbPp

6 Genotypic outcomes 1 BBPP 1 BBPP 2 BbPP 2 BbPP 1 bbPP 1 bbPP 2 BBPp 2 BBPp 3 BbPp 3 BbPp 2 bbPp 2 bbPp 1 BBpp 1 BBpp 2 Bbpp 2 Bbpp 1 bbpp 1 bbpp 16 combinations 9 possible outcomes Genotypic ratio 1:2:1:2:3:2:1:2:1

7 Phenotypic outcomes 9 Black coat, Polled 9 Black coat, Polled 1 BBPP 2 BBPp 2 BbPP 4 BbPp (All of the genotypes above produce the same phenotype)

8 Phenotypic outcomes 3 Black coat, horned 3 Black coat, horned 1 BBpp, 2 Bbpp 3 Red coat, Polled 3 Red coat, Polled 1 bbPP, 2 bbPp 1 Red coat, horned 1 Red coat, horned 1 bbpp

9 Phenotypic outcomes Phenotypic ratio Phenotypic ratio9:3:3:1

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