Genes C and P are complementary in sweet pea plant and when present together produces coloured flowers. What will be the product of cross between CcPp `×` Ccpp ?

Options

A. 2 white and 6 coloured flowers
B. 3 white and 5 coloured flowers
C. 2 coloured and 6 white flowers
D. 2 coloured and 6 white flowers

Answer

To solve the problem of determining the offspring from the cross between the sweet pea plants CcPp and Ccpp, we will follow these steps:

### Step 1: Identify the Genotypes of the Parents
The genotypes of the parents are:
- Parent 1: CcPp (heterozygous for both traits)
- Parent 2: Ccpp (heterozygous for C and homozygous recessive for P)

### Step 2: Determine the Gametes Produced by Each Parent
Next, we need to determine the possible gametes that each parent can produce:
- For CcPp, the gametes can be:
- CP
- Cp
- cP
- cp

- For Ccpp, the gametes can be:
- Cp
- cp

### Step 3: Set Up a Punnett Square
Now, we can set up a Punnett square to visualize the potential combinations of the gametes from each parent.

| | Cp | cp |
|--------|--------|--------|
| **CP** | CcPp | Ccpp |
| **Cp** | CcPp | Ccpp |
| **cP** | ccPp | ccpp |
| **cp** | ccPp | ccpp |

### Step 4: Determine the Genotypes of the Offspring
From the Punnett square, we can see the following genotypes of the offspring:
1. CcPp (colored flowers)
2. Ccpp (white flowers)
3. ccPp (colored flowers)
4. ccpp (white flowers)

### Step 5: Identify the Phenotypes
Now, we need to determine the phenotypes based on the genotypes:
- CcPp: Colored flowers (due to presence of both dominant alleles)
- Ccpp: White flowers (due to absence of P)
- ccPp: Colored flowers (due to presence of P)
- ccpp: White flowers (due to absence of both dominant alleles)

### Step 6: Count the Phenotypes
Now we can count the phenotypes:
- Colored flowers: 3 (2 from CcPp and 1 from ccPp)
- White flowers: 2 (1 from Ccpp and 1 from ccpp)

### Step 7: Determine the Ratio
The ratio of colored flowers to white flowers is:
- Colored: 3
- White: 2
- Therefore, the ratio is 3:2.

### Conclusion
The product of the cross between CcPp and Ccpp will yield a ratio of 3 colored flowers to 2 white flowers.

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