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?
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)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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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.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F4167b07b-ab2c-42e3-ab89-9f12261de975%2F0d76f274-5610-431a-bf9a-c6f3e3ef9fef%2F5lhijm8_processed.png&w=3840&q=75)
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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