Definition

Noun: A polygene is a type of gene that, individually, exerts only a small or negligible influence on an observable trait (phenotype). Its effect becomes significant only when it acts in combination with many other similar genes. These collective interactions produce continuous variation in traits like height, skin color, or weight.

Usage

The term is used primarily in genetics and biology to describe the genetic basis of complex, quantitative traits that are influenced by multiple genetic factors rather than a single gene. - Polygenes are responsible for most of the heritable variation in traits such as human stature. - Researchers are trying to identify the polygenes that contribute to susceptibility to certain diseases.

Examples

• Noun:
  • The inheritance of seed size in plants is controlled not by one gene, but by many polygenes.
  • Unlike Mendelian traits, characteristics influenced by polygenes do not show simple dominant/recessive patterns.
  • Scientists believe intelligence is influenced by a complex network of polygenes.

Advanced Usage

• Polygenic inheritance: This is the system of inheritance where a single phenotypic trait is controlled by the additive effects of many . This results in a continuous range of possible phenotypes, often forming a bell curve distribution in a population.
  • Skin pigmentation is a classic example of polygenic inheritance.

Variants and Related Words

• Polygenic (adjective): Pertaining to or determined by polygenes.
  • Height is a polygenic trait.
• Polygenesis (noun): A theory of origin involving multiple sources. (Note: This is a related but distinct term, often used in different scientific contexts like anthropology or linguistics).

Synonyms

• Quantitative trait locus (QTL): A genomic region associated with a quantitatively measured trait. While a QTL may contain one or more , the terms are closely related in the context of complex trait analysis.
• Minor gene: A less common synonym emphasizing the small individual effect.

Antonyms

• Major gene: A gene that has a large, readily detectable effect on the phenotype by itself.
• Mendelian gene: A gene that follows simple, single-gene inheritance patterns as described by Gregor Mendel.

Noun

1. a gene that by itself has little effect on the phenotype but which can act together with others to produce observable variations