66 "Genetic Problems" Cases of Complete Dominance 1. Gregor Mendel grew different varieties of pea plants in his garden. When he crossed yellow-seed plants with green-seed plants, he always got yellow pea seeds. a. What is the dominant allele? b. What is the genotype of all green-seed plants? c. Use the Punnett Square to show Mendel's cross. d. Do the parent yellow-seed plants have the same genotype as the offspring yellow-seed pea plant? Parent: Offspring: e. What genetic fact do you know about any yellow-seed pea plant? f. If yellow-seed pea plants are dominant to green-seed pea plants, why are there mostly green pea seeds in nature?

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**Educational Resource: Genetic Problems – Cases of Complete Dominance**

### Exercise #4: "Genetic Problems"

#### Cases of Complete Dominance

1. **Gregor Mendel's Pea Plant Experiment:**
   - **Scenario:** Mendel crossed yellow-seeded pea plants with green-seeded pea plants and consistently obtained yellow seeds.
   - **Questions:**
     - a. Identify the dominant allele.
     - b. Determine the genotype of all green-seeded plants.
     - c. Illustrate Mendel's cross using a Punnett Square.
     - d. Compare the genotype of parent yellow-seeded plants and offspring.
     - e. Discuss a genetic fact about yellow-seeded pea plants.
     - f. Explain why green pea seeds are more common if yellow-seeded plants are dominant.

2. **Human Eye Color Genetics:**
   - **Scenario:** A dark-eyed man and a light-eyed woman have ten dark-eyed children.
   - **Questions:**
     - a. Identify the dominant allele.
     - b. Determine the genotype of all light-eyed individuals.
     - c. Describe the genotypes of the parents.
     - d. Define the genotype difference between the dark-eyed parent and offspring.
     - e. Calculate the phenotype ratio of dark-eyed to light-eyed offspring from heterozygous dark-eyed parents using a Punnett Square.

### Diagrams:

- **Punnett Squares:**
  - **Description:** Two blank 2x2 Punnett Squares intended for illustrating genetic crosses, labeled for parental and offspring genetic outcomes.
  
### Special Note on Eye Color:

- **Overview:** Eye color results from multiple alleles and possibly more than one gene pair.
  - **Phenotypes:** Determined by genes regulating the amount and distribution of melanin, a pigment.
  - **Genetic Basis:** Most people have some pigmentation; albinism is an exception.
  - **Melanin's Role:** Eye color largely depends on melanin's location in the iris. Brown eyes result from concentrated melanin, while yellow or yellow-brown eyes have dilute melanin particles.

### Eye Illustration:

- A drawing of an eye accompanies the note, emphasizing the relationship between melanin and eye color.

This resource serves as a foundational exercise in understanding simple genetic dominance and how traits, such as seed color and eye color, are inherited.
Transcribed Image Text:**Educational Resource: Genetic Problems – Cases of Complete Dominance** ### Exercise #4: "Genetic Problems" #### Cases of Complete Dominance 1. **Gregor Mendel's Pea Plant Experiment:** - **Scenario:** Mendel crossed yellow-seeded pea plants with green-seeded pea plants and consistently obtained yellow seeds. - **Questions:** - a. Identify the dominant allele. - b. Determine the genotype of all green-seeded plants. - c. Illustrate Mendel's cross using a Punnett Square. - d. Compare the genotype of parent yellow-seeded plants and offspring. - e. Discuss a genetic fact about yellow-seeded pea plants. - f. Explain why green pea seeds are more common if yellow-seeded plants are dominant. 2. **Human Eye Color Genetics:** - **Scenario:** A dark-eyed man and a light-eyed woman have ten dark-eyed children. - **Questions:** - a. Identify the dominant allele. - b. Determine the genotype of all light-eyed individuals. - c. Describe the genotypes of the parents. - d. Define the genotype difference between the dark-eyed parent and offspring. - e. Calculate the phenotype ratio of dark-eyed to light-eyed offspring from heterozygous dark-eyed parents using a Punnett Square. ### Diagrams: - **Punnett Squares:** - **Description:** Two blank 2x2 Punnett Squares intended for illustrating genetic crosses, labeled for parental and offspring genetic outcomes. ### Special Note on Eye Color: - **Overview:** Eye color results from multiple alleles and possibly more than one gene pair. - **Phenotypes:** Determined by genes regulating the amount and distribution of melanin, a pigment. - **Genetic Basis:** Most people have some pigmentation; albinism is an exception. - **Melanin's Role:** Eye color largely depends on melanin's location in the iris. Brown eyes result from concentrated melanin, while yellow or yellow-brown eyes have dilute melanin particles. ### Eye Illustration: - A drawing of an eye accompanies the note, emphasizing the relationship between melanin and eye color. This resource serves as a foundational exercise in understanding simple genetic dominance and how traits, such as seed color and eye color, are inherited.
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