In peas, purple flowers are dominant to white. If a purple flowered, heterozygous plant were crossed with a white flowered plant, what is the expected ratio of genotypes in the offspring?

Human Anatomy & Physiology (11th Edition)
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Chapter1: The Human Body: An Orientation
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**Genetic Cross in Peas: Dominance of Purple Flowers**

In peas, purple flowers are dominant over white flowers. If we cross a heterozygous purple-flowered plant (Pp) with a white-flowered plant (pp), we aim to find the expected ratio of genotypes in the offspring.

To solve this, we use a Punnett square to visualize the genetic combinations:

- **Parents:**
  - Purple-flowered plant: Pp (heterozygous)
  - White-flowered plant: pp (homozygous recessive)

- **Possible Gametes:**
  - Purple plant can give gametes: P or p
  - White plant can give gametes: p

- **Punnett Square:**

  - |    | P | p |
    |----|---|---|
    | p  | Pp | pp |
    | p  | Pp | pp |

- **Genotype Ratio:**
  - 50% Pp (heterozygous purple)
  - 50% pp (homozygous white)

This means there is an equal chance of having purple or white flowers in the offspring, with a 1:1 genotype ratio of Pp to pp.
Transcribed Image Text:**Genetic Cross in Peas: Dominance of Purple Flowers** In peas, purple flowers are dominant over white flowers. If we cross a heterozygous purple-flowered plant (Pp) with a white-flowered plant (pp), we aim to find the expected ratio of genotypes in the offspring. To solve this, we use a Punnett square to visualize the genetic combinations: - **Parents:** - Purple-flowered plant: Pp (heterozygous) - White-flowered plant: pp (homozygous recessive) - **Possible Gametes:** - Purple plant can give gametes: P or p - White plant can give gametes: p - **Punnett Square:** - | | P | p | |----|---|---| | p | Pp | pp | | p | Pp | pp | - **Genotype Ratio:** - 50% Pp (heterozygous purple) - 50% pp (homozygous white) This means there is an equal chance of having purple or white flowers in the offspring, with a 1:1 genotype ratio of Pp to pp.
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