In Mirabilis jalapa when red flowered plants crossed with white flowered plant, the `F_(1)` progeny was

Options

A. Red
B. White
C. Pink
D. Varigated

Answer

To solve the question regarding the F1 progeny of Mirabilis jalapa when red-flowered plants are crossed with white-flowered plants, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Parent Plants**:
- We have two types of plants: red-flowered and white-flowered.
- Let’s denote the allele for red flowers as "R" (dominant) and the allele for white flowers as "r" (recessive).

2. **Determine the Genotypes of the Parents**:
- The red-flowered plant can be homozygous (RR) or heterozygous (Rr). However, since it is not specified, we will assume it is homozygous for simplicity.
- The white-flowered plant must be homozygous (rr) since it expresses the recessive trait.

3. **Cross the Parent Plants**:
- When we cross the red-flowered plant (RR) with the white-flowered plant (rr), we set up the following cross:
- RR (red) x rr (white)

4. **Determine the F1 Generation**:
- The offspring (F1 generation) will inherit one allele from each parent.
- All offspring will have the genotype Rr (heterozygous).

5. **Phenotype of the F1 Generation**:
- According to Mendel’s law of dominance, we would expect the phenotype to be red since R is dominant over r.
- However, in the case of Mirabilis jalapa, we observe incomplete dominance.

6. **Understanding Incomplete Dominance**:
- Incomplete dominance means that the dominant allele does not completely mask the effect of the recessive allele.
- Therefore, the heterozygous plants (Rr) will display a phenotype that is a blend of both parental traits.

7. **Conclusion**:
- In this case, the F1 progeny (Rr) will exhibit a pink flower color, which is the intermediate phenotype between red and white.

### Final Answer:
The F1 progeny of Mirabilis jalapa when red-flowered plants are crossed with white-flowered plants will have pink flowers.

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