Genetics Practice - Peas, Please!

Genetics Practice - Peas, Please!

Page 1: Pod Shapes and Colors

Pod Shapes

1. Pea Pod Shapes:

   • Inflated (dominant allele)
   • Constricted (recessive allele)

   Genotype	Phenotype
   II (Homozygous Inflated)	Inflated
   ii (Homozygous Constricted)	Constricted
   Ii (Heterozygous Inflated)	Inflated

2. Cross between Homozygous Inflated (II) and Homozygous Constricted (ii)

   • Offspring Phenotype: All offspring will be Inflated (100% Inflated)

3. Cross between Heterozygous Inflated (Ii) and Homozygous Constricted (ii)

   • Offspring Count:
     • Inflated: 50%
     • Constricted: 50%

4. Cross between Two Heterozygous Inflated (Ii x Ii)

   • Offspring Count:
     • Inflated: 75%
     • Constricted: 25%

Pod Colors

5. Pea Pod Colors:

   • Yellow (recessive allele)
   • Green (dominant allele)

   Genotype	Phenotype
   GG (Homozygous Green)	Green
   Gg (Heterozygous Green)	Green
   gg (Homozygous Yellow)	Yellow

6. Cross between Two Yellow Pod Plants (gg x gg)

   • Offspring Phenotype: All offspring will be Yellow (100% Yellow)

7. Cross between Heterozygous Green (Gg) and Yellow Pod (gg)

   • Offspring Count:
     • Yellow Pods: 50%
     • Green Pods: 50%

8. Axial Flowers vs. Terminal Flowers:

   • Axial (dominant allele)

   • Terminal (recessive allele)

   • Cross between Heterozygous Axial (Aa) and Terminal (aa)

     • Offspring Count:
     • Axial Flowers: 50%
     • Terminal Flowers: 50%

Page 2: Flower Colors and Plant Heights

Flower Colors

1. Pea Plant Flowers:

   • Purple (dominant allele)
   • White (recessive allele)

   Genotype	Phenotype
   PP (Homozygous Purple)	Purple
   Pp (Heterozygous Purple)	Purple
   pp (Homozygous White)	White

2. Cross between Homozygous Purple (PP) and Homozygous White (pp)

   • Offspring Phenotype: All offspring will be Purple (100% Purple)

3. Cross between Heterozygous Purple (Pp) and Homozygous White (pp)

   • Offspring Count:
     • Purple: 50%
     • White: 50%

4. Cross between Two Heterozygous Purple (Pp x Pp)

   • Offspring Count:
     • Purple: 75%
     • White: 25%

Plant Heights

5. Pea Plant Heights:

   • Tall (dominant allele)
   • Short (recessive allele)

   Genotype	Phenotype
   TT (Homozygous Tall)	Tall
   Tt (Heterozygous Tall)	Tall
   tt (Homozygous Short)	Short

6. Cross between Two Dwarf Plants (tt x tt)

   • Offspring Phenotype: All offspring will be Short (100% Short)

7. Cross between Heterozygous Tall (Tt) and Short (tt)

   • Offspring Count:
     • Tall: 50%
     • Short: 50%

8. Cross between Two Heterozygous Tall Plants (Tt x Tt)

   • Offspring Count:
     • Tall: 75%
     • Short: 25%

Student Details

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