How many types of combinations of gametes are possible in a monohybrid `F_(1)` parents

Options

A. Two
B. Four
C. Six
D. Eight

Answer

To determine how many types of combinations of gametes are possible in a monohybrid F1 parent, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Monohybrid Cross**: A monohybrid cross involves a single trait with two contrasting alleles. For example, let's consider the trait of plant height, where "Tall" (T) is dominant and "Dwarf" (t) is recessive.

2. **Identify Parent Genotypes**: In a typical monohybrid cross, we start with two purebred parents. For our example:
- One parent is homozygous tall (TT).
- The other parent is homozygous dwarf (tt).

3. **Determine Gametes from Each Parent**:
- The tall parent (TT) can only produce one type of gamete, which is T.
- The dwarf parent (tt) can only produce one type of gamete, which is t.

4. **F1 Generation Formation**: When we cross these two parents (TT x tt), the F1 generation will be:
- All offspring will be heterozygous (Tt).

5. **Gamete Formation in F1 Generation**: Now, we need to determine the types of gametes that the F1 generation (Tt) can produce:
- The F1 individual (Tt) can produce two types of gametes: T and t.

6. **Count the Combinations**: Since the F1 parent can produce two types of gametes (T and t), the total number of combinations of gametes possible in the F1 generation is:
- 2 (T and t).

### Final Answer:
Thus, the number of types of combinations of gametes possible in a monohybrid F1 parent is **2**.

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