Definition

Noun: * Mendelianism: The theory of heredity and biological inheritance based on the principles and laws formulated by Gregor Mendel. It explains how traits are passed from parents to offspring through discrete units (now called genes) that follow specific patterns of dominance, segregation, and independent assortment.

Usage

• Mendelianism is used as a formal, historical term in biology and genetics to refer to the foundational classical theory of inheritance.
• It is often discussed in contrast with or as the basis for more complex modern genetic theories that account for phenomena like polygenic inheritance, linkage, and epigenetics.

Examples

• The rediscovery of Mendel's work in 1900 led to the rapid acceptance of Mendelianism in the scientific community.
• Early 20th-century geneticists used Mendelianism to explain the inheritance patterns of simple traits like pea plant flower color.
• While Mendelianism provides the core rules, modern genetics has expanded upon it to explain more complex inheritance patterns.

Advanced Usage

• "Classical Mendelianism": A term used to specify the original, strict interpretation of Mendel's laws before the discovery of DNA and molecular genetics.
• "Mendelianism vs. Biometry": Refers to a historical debate in early genetics between proponents of Mendel's discrete unit theory and those who believed traits were blended and continuously variable.

Variants and Related Words

• Mendelian (adjective): Pertaining to Mendel or his theories.
  • Example: A Mendelian trait follows simple dominant/recessive inheritance patterns.
• Mendelism (noun): A synonym for Mendelianism.
• Non-Mendelian (adjective): Describing patterns of inheritance that do not follow Mendel's simple laws (e.g., incomplete dominance, codominance).

Synonyms

• Mendelism
• Mendelian theory
• Mendelian genetics (in its classical sense)

Related Terms and Concepts

• Mendel's Laws: The specific principles (Law of Segregation, Law of Independent Assortment) that form the basis of Mendelianism.
• Gene: The modern term for Mendel's "hereditary factor."
• Genotype/Phenotype: Concepts central to Mendelian analysis.
• Dominant/Recessive: The relationship between alleles as described by Mendelianism.

Noun

1. the theory of inheritance based on Mendel's laws