`F1_()` progeny of Mendelian dihybrid cross produce

Options

A. Two types of pollen grains
B. Four genotypes of gametes
C. Two types of eggs
D. Four type of pollens only

Answer

To solve the question regarding the F1 progeny of a Mendelian dihybrid cross, we can follow these steps:

### Step 1: Understand the Dihybrid Cross
A dihybrid cross involves two traits, each represented by two alleles. For example, consider traits for seed shape (round vs. wrinkled) and seed color (yellow vs. green).

### Step 2: Define the Genotypes
For the traits:
- Round (R) is dominant over wrinkled (r).
- Yellow (Y) is dominant over green (y).

The parental genotypes can be defined as:
- Round Yellow: RRYY
- Wrinkled Green: rryy

### Step 3: Determine the F1 Generation
When we cross these two parental genotypes (RRYY x rryy), all offspring in the F1 generation will be heterozygous for both traits:
- F1 Genotype: RrYy

### Step 4: Gamete Formation
Each F1 plant can produce gametes that contain one allele from each gene. The possible combinations of alleles in the gametes can be determined using the FOIL method (First, Outside, Inside, Last):
- Possible gametes from RrYy:
1. RY (Round Yellow)
2. Ry (Round Green)
3. rY (Wrinkled Yellow)
4. ry (Wrinkled Green)

### Step 5: Conclusion
Thus, the F1 progeny of a Mendelian dihybrid cross produces **four genotypes of gametes**: RY, Ry, rY, and ry.

### Final Answer
The F1 progeny of a Mendelian dihybrid cross produce **four genotypes of gametes**.

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