Reciprocal cross is .

Options

A. Intrapecific hybridization
B. Back cross
C. Pollen grains from one variety deposited on the stigma of the contrasting variety and vice versa, in hybridization experiments
D. Test cross

Answer

### Step-by-Step Solution:

1. **Definition of Reciprocal Cross**: A reciprocal cross is a breeding experiment where two parent organisms are crossed in two different ways to observe the inheritance of traits. In one cross, the first organism is the male parent and the second is the female parent. In the reciprocal cross, their roles are reversed.

2. **Purpose of Reciprocal Cross**: The main aim of a reciprocal cross is to determine how traits are inherited from parents to offspring, especially when examining traits that may be sex-linked or influenced by the sex of the parent.

3. **Example Using Mendel's Pea Plants**: For instance, if we consider Mendel's pea plants, we can cross a pure tall plant (TT) with a pure dwarf plant (tt). In the first cross, the tall plant is the male and the dwarf is the female. The F1 generation will all be heterozygous tall (Tt).

4. **Performing the Reciprocal Cross**: In the reciprocal cross, we switch the roles of the parents. Now, the dwarf plant (tt) is the male and the tall plant (TT) is the female. This allows us to observe if there are any differences in the offspring when the parent roles are reversed.

5. **Analyzing Results**: By comparing the offspring from both crosses, we can determine if the inheritance of the trait (in this case, height) is influenced by the sex of the parent. If the results differ significantly, it suggests that the trait may be sex-linked or influenced by the parent's gender.

6. **Conclusion**: Thus, a reciprocal cross is a valuable tool in genetics to understand the inheritance patterns of traits and how they may be affected by the sex of the parents involved in the cross.