Phenotype Ratio of Dihybrid Cross
In a dihybrid cross, where two traits controlled by different genes are considered simultaneously, the resulting phenotype ratio among the offspring can be determined using the principles of Mendelian genetics. The phenotype ratio is influenced by the types of alleles inherited from the parental generation and follows specific patterns based on the mode of inheritance for each trait.
For example, in a dihybrid cross involving traits with complete dominance, such as seed color (Y = yellow, y = green) and seed shape (R = round, r = wrinkled) in pea plants, the resulting phenotype ratio among the F2 generation is typically 9:3:3:1. This ratio represents the proportions of offspring exhibiting different combinations of phenotypes based on the inheritance of alleles for both traits.
The phenotype ratio of a dihybrid cross provides insights into the independent assortment of alleles for each gene during gamete formation and the distribution of traits among the offspring population. Understanding these ratios is crucial for predicting the phenotypic outcomes of genetic crosses and highlighting the inheritance patterns of complex traits.
The ratio of dihybrid cross is 9:3:3:1.
Phenotype Ratio of Dihybrid Cross
Phenotype Meaning and Examples – Phenotype vs Genotype
Phenotype refers to the observable characteristics of an organism, influenced by both genetic and environmental factors. Studying the phenotype meaning and phenotype ratio helps in understanding how genetic and environmental factors interact to determine an organism’s observable traits.
In this article, we will cover in detail phenotype meaning, examples, and phenotype ratios.
Table of Content
- Phenotype Meaning
- Phenotype Expression – Factors Affecting Phenotype Expression
- Phenotype Ratio of Dihybrid Cross
- Phenotype Ratio of Monohybrid Cross
- Phenotype Examples
- Phenotype vs Genotype – Phenotype and Genotype Difference
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