If dominant C and P genes ae essential for the development of purple and white flower in a cross between CcPp `xx` ccPp

Options

A. `9:7`
B. `3:5`
C. `5:3`
D. `1:3`

Answer

To solve the problem regarding the cross between the flower genotypes CcPp and ccPp, we will follow these steps:

### Step-by-Step Solution:

1. **Identify the Genotypes**:
- The first parent (P1) has the genotype CcPp (heterozygous for both traits).
- The second parent (P2) has the genotype ccPp (homozygous recessive for C and heterozygous for P).

2. **Determine Gametes**:
- From P1 (CcPp), the possible gametes are: CP, Cp, cP, cp.
- From P2 (ccPp), the possible gametes are: cP, cp.

3. **Set Up the Punnett Square**:
- Create a 2x4 Punnett square to combine the gametes from both parents.
- The rows will represent the gametes from P2 (cP, cp), and the columns will represent the gametes from P1 (CP, Cp, cP, cp).

4. **Fill in the Punnett Square**:
- Combine the gametes:
- cP x CP = CcPP (Purple)
- cP x Cp = CcPp (Purple)
- cP x cP = ccPP (White)
- cP x cp = ccPp (White)
- cp x CP = CcPp (Purple)
- cp x Cp = Ccpp (White)
- cp x cP = ccPp (White)
- cp x cp = ccpp (White)

5. **Count the Phenotypes**:
- From the combinations, we can identify the phenotypes:
- Purple flowers (CcPP, CcPp): 3 occurrences
- White flowers (ccPP, ccPp, Ccpp, ccpp): 5 occurrences

6. **Determine the Ratio**:
- The ratio of purple to white flowers is 3:5.

### Final Answer:
The phenotypic ratio of purple to white flowers in the cross between CcPp and ccPp is **3:5**.

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