The cross between recessive to it's hybrid or its ' `F_(1)` plant is called

Options

A. Back cross
B. Test cross
C. Monohybrid cross
D. Dihybrid cross

Answer

To solve the question, "The cross between recessive to its hybrid or its 'F1' plant is called," we can follow these steps:

### Step 1: Understand the Terms
- **Hybrid (F1)**: This is the first generation offspring resulting from a cross between two different parental lines. In this case, it refers to a plant that is heterozygous for a trait (e.g., tall vs. dwarf).
- **Recessive**: This refers to the trait that is not expressed in the presence of a dominant trait. For example, if tall (T) is dominant and dwarf (t) is recessive, a dwarf plant would have the genotype (tt).

### Step 2: Identify the Cross
- The question asks about a specific type of cross involving a recessive individual and its hybrid (F1) plant.
- The hybrid plant can either be homozygous dominant (TT) or heterozygous (Tt).

### Step 3: Determine the Type of Cross
- When you cross a recessive individual (tt) with a hybrid individual (Tt), the offspring will show a phenotypic ratio of 1 tall (Tt) to 1 dwarf (tt). This type of cross is specifically designed to determine the genotype of the hybrid plant.

### Step 4: Choose the Correct Answer
- The correct term for this type of cross is a **Test Cross**. This is because it tests the genotype of the hybrid by crossing it with a known recessive individual.

### Final Answer
The answer to the question is **B. Test Cross**.

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