How many types of gametes are required for `F_(2)` generation of a monohybrid cross ?

Options

A. 2
B. 4
C. 16
D. 8

Answer

To determine how many types of gametes are required for the F2 generation of a monohybrid cross, we can follow these steps:

### Step 1: Understand the Monohybrid Cross
A monohybrid cross involves a single trait that is controlled by one gene with two alleles. For example, let's consider the trait for pod color in pea plants, where green pods (G) are dominant over yellow pods (g).

### Step 2: Determine the Parental Generation
In a monohybrid cross, we start with two true-breeding parents:
- One parent with homozygous dominant genotype (GG) for green pods.
- One parent with homozygous recessive genotype (gg) for yellow pods.

### Step 3: Create the F1 Generation
When these two parents are crossed, all offspring in the F1 generation will be heterozygous (Gg) because they inherit one allele from each parent.

### Step 4: Self-Pollination of F1 Generation
To create the F2 generation, the F1 individuals (Gg) are allowed to self-pollinate. This means that each F1 plant will produce gametes.

### Step 5: Determine the Types of Gametes
Each F1 plant (Gg) can produce two types of gametes:
- One type with the dominant allele (G)
- One type with the recessive allele (g)

### Step 6: Calculate the F2 Generation
When two F1 plants (Gg) are crossed, the possible combinations of gametes will lead to the following genotypes in the F2 generation:
- GG (homozygous dominant)
- Gg (heterozygous)
- gg (homozygous recessive)

### Conclusion
In total, there are 2 types of gametes produced by the F1 generation (G and g), which are required for the F2 generation.

Thus, the answer is:
**2 types of gametes are required for the F2 generation of a monohybrid cross.**

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