Law of dominance is proved by

Options

A. Incomplete dominance
B. Back cross
C. Monohybrid cross
D. Dihybrid cross

Answer

**Step-by-Step Solution:**

1. **Understanding the Law of Dominance**: The Law of Dominance is one of Mendel's laws of inheritance, stating that in a heterozygous condition, one allele (the dominant allele) can mask the expression of another allele (the recessive allele).

2. **Mendel's Experiments**: Mendel conducted experiments using the Garden Pea (Pisum sativum) to study inheritance patterns. He focused on seven contrasting traits, including plant height.

3. **Contrasting Traits**: For the trait of plant height, Mendel identified two phenotypes: tall (dominant) and dwarf (recessive). The tall phenotype is represented by the dominant allele (T), while the dwarf phenotype is represented by the recessive allele (t).

4. **Monohybrid Cross**: Mendel performed a monohybrid cross by crossing a pure tall plant (TT) with a pure dwarf plant (tt). The resulting offspring (F1 generation) were all heterozygous (Tt).

5. **Observation of F1 Generation**: In the F1 generation, all plants exhibited the tall phenotype, despite being heterozygous (Tt). This demonstrates that the dominant allele (T) suppresses the expression of the recessive allele (t).

6. **Conclusion**: The results of the monohybrid cross clearly illustrate the Law of Dominance, as the phenotype of the offspring resembles that of the dominant parent, even though the recessive allele is present in the genotype.

7. **Final Proof**: Therefore, the Law of Dominance is proved by conducting a simple monohybrid cross, where the dominant trait is expressed in the phenotype of the offspring.

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