Definition

Noun: 1. Hybrid vigor: In genetics, heterosis refers to the phenomenon where a hybrid (the offspring of two genetically different parents) exhibits greater size, growth rate, fertility, or overall fitness than either of its parents. It is the increased function of any biological quality in a hybrid offspring.

Usage

• Heterosis is a fundamental concept in agriculture and animal breeding, where it is exploited to produce crops and livestock with superior yields, resilience, or other desirable traits.
• The term is used in scientific and technical contexts related to genetics, biology, and breeding programs.

Examples

• "The remarkable yield of the hybrid corn is a classic example of heterosis."
• "Breeders utilize heterosis to develop poultry lines with faster growth rates."
• "The study aimed to measure the level of heterosis in the new crossbred tomato variety."

Advanced Usage

• The genetic basis of heterosis: This phrase refers to the scientific theories (like dominance or overdominance) that explain why heterosis occurs at the molecular level.
  • Example: "Researchers are still debating the primary genetic basis of heterosis."
• To exhibit heterosis: A common verb collocation describing the hybrid's display of superior qualities.
  • Example: "The F1 generation clearly exhibited significant heterosis for plant height."

Variants and Related Words

• Hybrid Vigor (n.): This is the most common synonym and alternative term for heterosis, often used interchangeably.
• Hybrid (n./adj.): The organism that results from crossbreeding and may display heterosis.
• Crossbreeding (n.): The act of mating organisms from different breeds or varieties, which can lead to heterosis.
• F1 Generation (n.): In genetics, the first filial generation of offspring from distinctly different parental types. This generation typically shows the strongest heterosis.

Synonyms

• Hybrid vigor

Antonyms

• Inbreeding depression (the reduced fitness and biological quality which results from inbreeding, opposite to heterosis)

Noun

1. (genetics) the tendency of a crossbred organism to have qualities superior to those of either parent