Mendal proposed _____ postulates which have been called Principles of Inheritance.

Options

A. 3
B. 4
C. 7
D. 14

Answer

**Step-by-Step Text Solution:**

1. **Understanding the Question**: The question asks how many postulates Mendel proposed that are referred to as the Principles of Inheritance.

2. **Identifying Mendel's Work**: Gregor Mendel, known as the father of genetics, conducted experiments primarily on pea plants to understand inheritance patterns.

3. **Monohybrid Cross**: Mendel's first set of postulates came from his experiments on monohybrid crosses, where he focused on one trait at a time.

4. **Laws from Monohybrid Cross**:
- **Law of Dominance**: This law states that in a heterozygous condition, one allele (the dominant one) will express itself over the other allele (the recessive one). For example, in a cross between tall (T) and dwarf (t) plants, the tall trait will dominate.
- **Law of Segregation**: This law states that during the formation of gametes, the two alleles for a trait segregate from each other so that each gamete carries only one allele for each trait.

5. **Dihybrid Cross**: Mendel also conducted dihybrid crosses, which involved two traits at the same time.

6. **Law from Dihybrid Cross**:
- **Law of Independent Assortment**: This law states that the alleles for different traits are distributed to gametes independently of one another.

7. **Conclusion**: In total, Mendel proposed three postulates which are known as the Principles of Inheritance: the Law of Dominance, the Law of Segregation, and the Law of Independent Assortment.

**Final Answer**: Mendel proposed **three** postulates which have been called Principles of Inheritance.

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