What is Genotypic Ratio _ It’s Meaning and Definition Pattern of offspring distribution

Genotypic Ratio – Meaning, Definition, and Pattern of Offspring Distribution

Definition:

Genotypic Ratio refers to the ratio of different genetic makeups (genotypes) among the offspring resulting from a genetic cross.

It is used in Mendelian genetics to describe the frequency of allelic combinations (like AA, Aa, aa) in the offspring of a cross.

Meaning:

Each organism inherits two alleles for each trait—one from each parent. The genotypic ratio tells us how these alleles combine in the next generation.

Genotype = The genetic constitution (e.g., TT, Tt, or tt for a height trait)

Example: Monohybrid Cross

Cross: Tt × Tt (Tall heterozygous × Tall heterozygous)

Offspring Genotypes:

• 1 TT (homozygous dominant)

• 2 Tt (heterozygous)

• 1 tt (homozygous recessive)

Genotypic Ratio:

1 : 2 : 1

• 1 TT

• 2 Tt

• 1 tt

Pattern of Offspring Distribution:

• Shows how often each genotype appears in the offspring.

• Helps predict inheritance patterns for traits.

• Important in understanding dominant, recessive, and co-dominant traits.

Genotypic Ratio vs. Phenotypic Ratio:

Summary:

Genotypic Ratio is the numerical representation of different genotypes among the offspring of a genetic cross. It helps scientists predict and study how traits are inherited from one generation to the next.

Let me know if you’d like a diagram or a Punnett square example!

What is Genotypic Ratio _ It’s Meaning and Definition Pattern of offspring distribution

Principles of Inheritance and Variation.pmd