Codominance worksheet - Free Printable

Problem Analysis:

The task involves understanding and distinguishing between Incomplete Dominance and Codominance, two patterns of inheritance in genetics. The worksheet provides examples using cows, flowers, and other animals to illustrate these concepts. The goal is to identify which pattern (Incomplete Dominance or Codominance) applies to each scenario.

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Key Concepts:

1. Incomplete Dominance:
- When the heterozygote (offspring with one allele from each parent) exhibits a phenotype that is intermediate between the phenotypes of the homozygous parents.
- Example: Red flower (RR) + White flower (WW) → Pink flower (RW).

2. Codominance:
- When both alleles are fully expressed in the heterozygote, resulting in a phenotype that shows traits from both parents.
- Example: Black cow (BB) + White cow (WW) → Cow with black and white patches (BW).

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Solution:

#### Part 1: Cows
- Parents: Black cow (BB) and White cow (WW).
- Offspring: Cow with black and white patches (BW).
- Explanation: In this case, the offspring displays both black and white patches, indicating that both alleles (B and W) are fully expressed. This is characteristic of Codominance.
- Answer: Co Dominance.

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#### Part 2: Flowers
- Left Panel:
- Parents: Red flower (RR) and White flower (WW).
- Offspring: Pink flower (RW).
- Explanation: The offspring has a pink color, which is an intermediate phenotype between red and white. This indicates Incomplete Dominance.
- Answer: Incomplete Dominance.

- Right Panel:
- Parents: Red flower (RR) and White flower (WW).
- Offspring: Flower with red and white spots (RW).
- Explanation: The offspring displays both red and white spots, indicating that both alleles are fully expressed. This is characteristic of Codominance.
- Answer: Co Dominance.

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#### Part 3: Fill in the Table
The table asks you to classify the given scenarios as either Incomplete Dominance or Codominance.

1. Flowers (Red × Blue → Purple):
- Explanation: The offspring (purple flower) exhibits an intermediate phenotype between red and blue. This is characteristic of Incomplete Dominance.
- Answer: Incomplete Dominance.

2. Flowers (White × Red → Orange):
- Explanation: The offspring (orange flower) exhibits an intermediate phenotype between white and red. This is characteristic of Incomplete Dominance.
- Answer: Incomplete Dominance.

3. Horses (Brown × White → Roan):
- Explanation: The offspring (roan horse) has a coat with both brown and white hairs intermingled, indicating that both alleles are fully expressed. This is characteristic of Codominance.
- Answer: Co Dominance.

4. Chickens (Black × White → Speckled):
- Explanation: The offspring (speckled chicken) has feathers with both black and white speckles, indicating that both alleles are fully expressed. This is characteristic of Codominance.
- Answer: Co Dominance.

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Final Answer:

#### Part 1:
- Co Dominance

#### Part 2:
- Left Panel: Incomplete Dominance
- Right Panel: Co Dominance

#### Part 3:
| Incomplete Dominance | Co Dominance |
|----------------------|--------------|
| Flowers (Red × Blue → Purple) | Horses (Brown × White → Roan) |
| Flowers (White × Red → Orange) | Chickens (Black × White → Speckled) |

Final Boxed Answer:
\[
\boxed{
\begin{array}{|c|c|}
\hline
\text{Incomplete Dominance} & \text{Co Dominance} \\
\hline
\text{Flowers (Red × Blue → Purple)} & \text{Horses (Brown × White → Roan)} \\
\text{Flowers (White × Red → Orange)} & \text{Chickens (Black × White → Speckled)} \\
\hline
\end{array}
}
\]