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 Is the purple plant homozygous or heterozygous ?  Perform a test cross!  Always! Cross the unknown with a homozygous recessive Test Cross.

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Presentation on theme: " Is the purple plant homozygous or heterozygous ?  Perform a test cross!  Always! Cross the unknown with a homozygous recessive Test Cross."— Presentation transcript:

1  Is the purple plant homozygous or heterozygous ?  Perform a test cross!  Always! Cross the unknown with a homozygous recessive Test Cross

2 g g GG GG gg gg P F1F1 Key: G=green g= yellow Key: G=green g= yellow Phenotype: 100% green Genotype: 100% heterozygous ? x gg

3 P F1F1 Key: G=green g= yellow Key: G=green g= yellow Phenotype: 50% green 50% yellow Genotype:

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5  Neither allele is dominant  In some cases, an intermediate phenotype is shown

6  In snapdragons, flower color can be red, pink, or white. The heterozygous condition results in pink flowers rrRr RR

7 Key: R= Red r= White Key: R= Red r= White F1 Phenotype: 100% pink F1 Genotype: 100% heterozygous Rr F1 Phenotype: 100% pink F1 Genotype: 100% heterozygous Rr

8 Key: R= Red r= White Key: R= Red r= White Phenotype: 1:2:1 25% Red 25% White 50% Pink Genotype: 1:2:1 25% homozygous RR 25% homozygous rr 50% heterozygous Rr Phenotype: 1:2:1 25% Red 25% White 50% Pink Genotype: 1:2:1 25% homozygous RR 25% homozygous rr 50% heterozygous Rr

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10  Both alleles are expressed equally  Neither allele is more dominant than the other Erminette chickens Roan Cows

11  P generation  Black chicken X White chicken  F1 generation = erminette (checkered patterned) Key: B =Black B 1 = White Key: B =Black B 1 = White BB B1B1 B1B1 B BB BB1B1 B1B1 B1B1 B1B1 Phenotype: 4:0 or 1:0 100% erminette Genotype: 4:0 or 1:0 100% heterozygous Phenotype: 4:0 or 1:0 100% erminette Genotype: 4:0 or 1:0 100% heterozygous

12 B B B W B BWBW BBB B BWBW BWBW BWBW BWBW Key: B= Black W= White Key: B= Black W= White Key: B B =Black B W = White Key: B B =Black B W = White B1B1 B1B1 B2B2 B2B2 B1B1 B1B1 B1B1 B1B1 B2B2 B2B2 B2B2 B2B2 Key: B 1 =Black B 2 = White Key: B 1 =Black B 2 = White


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