Non-Mendelian Genetics Practice worksheet - Free Printable

Problem Analysis:

The scenario involves incomplete dominance in the Royal Fuzz plant, where:
- RR (homozygous dominant) produces a red flower.
- rr (homozygous recessive) produces a blue flower.
- Rr (heterozygous) produces a purple flower.

We need to solve two Punnett squares and determine the genotype and phenotype ratios for each scenario:
1. Purple Flower x Purple Flower (Rr × Rr)
2. Red Flower x Purple Flower (RR × Rr)

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Scenario 1: Purple Flower x Purple Flower (Rr × Rr)

#### Step 1: Set up the Punnett Square
The parents are both heterozygous (Rr). The possible gametes from each parent are R and r.

| | R | r |
|-------|-------|-------|
| R | RR | Rr |
| r | Rr | rr |

#### Step 2: Determine Genotypes and Phenotypes
- Genotypes:
- RR: 1
- Rr: 2
- rr: 1

- Phenotypes:
- Red (RR): 1
- Purple (Rr): 2
- Blue (rr): 1

#### Step 3: Calculate Ratios
- Genotype Ratios:
- RR : Rr : rr = 1 : 2 : 1
- Phenotype Ratios:
- Red : Purple : Blue = 1 : 2 : 1

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Scenario 2: Red Flower x Purple Flower (RR × Rr)

#### Step 1: Set up the Punnett Square
The parents are RR (homozygous dominant) and Rr (heterozygous). The possible gametes are:
- From RR: R
- From Rr: R or r

| | R | r |
|-------|-------|-------|
| R | RR | Rr |

#### Step 2: Determine Genotypes and Phenotypes
- Genotypes:
- RR: 2
- Rr: 2

- Phenotypes:
- Red (RR): 2
- Purple (Rr): 2
- Blue (rr): 0

#### Step 3: Calculate Ratios
- Genotype Ratios:
- RR : Rr = 1 : 1
- Phenotype Ratios:
- Red : Purple : Blue = 1 : 1 : 0

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Final Answers:

#### Scenario 1: Purple Flower x Purple Flower (Rr × Rr)
- Genotype Ratios: RR : Rr : rr = 1 : 2 : 1
- Phenotype Ratios: Red : Purple : Blue = 1 : 2 : 1

#### Scenario 2: Red Flower x Purple Flower (RR × Rr)
- Genotype Ratios: RR : Rr = 1 : 1
- Phenotype Ratios: Red : Purple : Blue = 1 : 1 : 0

Boxed Final Answer:

\[
\boxed{
\begin{array}{l}
\text{Scenario 1:} \\
\text{Genotype Ratios: RR : Rr : rr = 1 : 2 : 1} \\
\text{Phenotype Ratios: Red : Purple : Blue = 1 : 2 : 1} \\
\\
\text{Scenario 2:} \\
\text{Genotype Ratios: RR : Rr = 1 : 1} \\
\text{Phenotype Ratios: Red : Purple : Blue = 1 : 1 : 0}
\end{array}
}
\]