How do Mendel's experiments explain inheritance?

Mendel’s experiments explain inheritance by demonstrating how traits are passed from parents to offspring through discrete units called genes, following specific patterns and laws.

He conducted experiments on pea plants and observed how traits were inherited across generations.

Key aspects of Mendel’s experiments:

1. Selection of contrasting traits
Mendel chose traits with clear differences, such as tall vs dwarf plants and round vs wrinkled seeds.

2. Controlled cross-pollination
He cross-pollinated plants to study how traits were passed to offspring.

3. Observation of generations:

• P generation (parental): Pure traits (e.g., tall × dwarf)

• F₁ generation: All offspring showed only one trait (dominant)

• F₂ generation: Both traits appeared in a ratio (usually 3:1)

Laws explained by Mendel:

1. Law of Dominance
One allele (dominant) masks the expression of another (recessive).

2. Law of Segregation
Alleles separate during gamete formation, so each gamete carries only one allele.

3. Law of Independent Assortment
Different traits are inherited independently of each other (applies to genes on different chromosomes).

Significance:

• Established the foundation of genetics

• Explained predictable inheritance patterns

• Introduced the concept of genes and alleles

In simple terms: Mendel showed that traits are inherited through genes that follow specific rules, explaining why offspring resemble their parents.