If a cross is made between AA and aa, the nature of `F_(1)` progeny will be

Options

A. genotypically AA, phenotypically a
B. genotypically Aa, phenotypically a
C. eenotypically Aa, phenotypically A
D. genotypically aa, phenotypically A

Answer

To solve the question regarding the nature of the F1 progeny resulting from a cross between AA and aa, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Parent Genotypes:**
- The first parent is homozygous dominant (AA).
- The second parent is homozygous recessive (aa).

2. **Determine the Gametes Produced:**
- The AA parent can only produce one type of gamete: A.
- The aa parent can only produce one type of gamete: a.

3. **Perform the Cross:**
- When we cross the gametes from both parents, we combine A from the AA parent with a from the aa parent.
- The resulting genotype of the F1 progeny will be Aa.

4. **Determine the Genotype of F1 Progeny:**
- The F1 progeny has the genotype Aa, which is heterozygous.

5. **Determine the Phenotype of F1 Progeny:**
- Since A is dominant over a, the phenotype of the F1 progeny will express the dominant trait associated with the A allele.

6. **Conclusion:**
- The nature of the F1 progeny is that it is heterozygous (genotype Aa) and exhibits the dominant phenotype.

### Final Answer:
The F1 progeny will be heterozygous (genotype Aa) and will express the dominant trait phenotypically.

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