Question
GeneralGeneralGeneral

What is the difference between monohybrid and dihybrid cross?

Verified Answer

Monohybrid and dihybrid crosses are types of genetic crosses used to study inheritance patterns, differing in the number of traits involved.

Monohybrid cross involves the inheritance of a single trait, while dihybrid cross involves the inheritance of two traits simultaneously.

Key differences:

  • Number of traits:
    Monohybrid: one trait
    Dihybrid: two traits

  • Gene pairs involved:
    Monohybrid: one pair of alleles
    Dihybrid: two pairs of alleles

  • Punnett square complexity:
    Monohybrid: simple (2×2 grid)
    Dihybrid: more complex (4×4 grid)

  • Phenotypic ratio (F₂ generation):
    Monohybrid: 3:1
    Dihybrid: 9:3:3:1

  • Example:
    Monohybrid: Tall (T) × Short (t)
    Dihybrid: Round Yellow (RRYY) × Wrinkled Green (rryy)

  • Purpose:
    Monohybrid studies inheritance of one characteristic; dihybrid studies interaction and independent assortment of two traits.

In simple terms: Monohybrid cross studies one trait, while dihybrid cross studies two traits at the same time.