Morelia Viridis - Red/Yellow Genetics Calculator

Understanding the inheritance of red and yellow coloration in Morelia viridis

Use this educational tool to predict offspring colors based on parent genotypes. The red trait (R) is dominant over yellow (y).

How Red/Yellow Genetics Work

Possible Genotypes

  • yy - Homozygous recessive - Yellow phenotype
  • Ry - Heterozygous - Red phenotype (carrier of yellow)
  • RR - Homozygous dominant - Red phenotype

Dominance Pattern

The red allele (R) is dominant over the yellow allele (y). This means any snake with at least one R allele will display red coloration.

Complete Cross Results Table

This table shows all possible crosses between the three genotypes and their expected outcomes.

Cross Genotype Distribution Phenotype Distribution
yy × yy
yy: 100%
Yellow: 100%
Ry × yy
yy: 50% Ry: 50%
Yellow: 50% Red: 50%
Ry × Ry
yy: 25% Ry: 50% RR: 25%
Yellow: 25% Red: 75%
RR × yy
Ry: 100%
Red: 100%
RR × Ry
Ry: 50% RR: 50%
Red: 100%
RR × RR
RR: 100%
Red: 100%

Interactive Genetics Calculator

Select two parent genotypes below to calculate the expected offspring ratios. You can also click any row in the table above to quickly fill in the calculator.