Definition

1. Noun:
   • A genetic cross between two organisms that are identically hybrid for two traits: A "dihybrid cross" is a breeding experiment that examines the inheritance of two different traits, where each parent is heterozygous (carries two different alleles) for both traits in question.

Usage

• The term "dihybrid cross" is used specifically in the field of genetics and biology. It describes a standard experimental method to study how two pairs of alleles segregate and assort independently during gamete formation, as illustrated by Gregor Mendel's experiments with pea plants.

Examples

• Noun:
  • Mendel's dihybrid cross involving pea plants with round/yellow seeds and wrinkled/green seeds demonstrated the law of independent assortment.
  • To predict the phenotypic ratio of the offspring, the biologist set up a dihybrid cross between two heterozygous fruit flies.

Advanced Usage

• "to perform/conduct a dihybrid cross": This phrase describes the action of carrying out this specific genetic experiment.
  • The students were instructed to perform a dihybrid cross using Punnett squares to visualize the potential offspring genotypes.

Variants and Related Words

• Monohybrid cross (n): A genetic cross that examines the inheritance of a single trait.
  • Understanding a monohybrid cross is a prerequisite for learning about a dihybrid cross.
• Dihybrid (n/adj): Referring to an individual that is heterozygous for two traits.
  • The dihybrid parent plant had the genotype RrYy.

Synonyms

• Two-trait cross: A less technical synonym describing the same experimental concept.
• Mendelian cross involving two characters: A descriptive phrase emphasizing its foundational role in Mendelian genetics.

Related Concepts

• Punnett square: A diagram used to predict the outcome of a dihybrid cross.
  • A 4x4 Punnett square is needed to map all possible gamete combinations from a dihybrid cross.
• Law of Independent Assortment: The genetic principle famously demonstrated by dihybrid crosses.
  • The results of the dihybrid cross provided clear evidence for the Law of Independent Assortment.

Noun

1. hybridization using two traits with two alleles each