1. What is Dihybrid Cross Probability?

The dihybrid cross probability calculates the chance of offspring inheriting specific combinations of two traits from heterozygous parents (AaBb × AaBb). It follows Mendel's principle of independent assortment.

2. How Does the Calculator Work?

The calculator uses the probability formula:

Where:

• \( 3/4 \) — Probability of dominant phenotype for one trait
• \( 1/4 \) — Probability of recessive phenotype for one trait
• \( dominant \) — Number of dominant traits in the phenotype
• \( recessive \) — Number of recessive traits (4 - dominant)

Explanation: For each of the two traits, there's a 3:1 ratio of dominant:recessive phenotypes in offspring of heterozygous parents.

3. Importance of Dihybrid Cross Calculation

Details: Understanding dihybrid crosses is fundamental in genetics for predicting offspring genotypes and phenotypes, and for understanding inheritance patterns of multiple traits.

4. Using the Calculator

Tips: Enter the number of dominant traits (0-4) you want to calculate the probability for. The calculator will compute the exact probability of that combination occurring.

5. Frequently Asked Questions (FAQ)

Q1: What's the 9:3:3:1 ratio?
A: This is the phenotypic ratio for dihybrid crosses: 9 with both dominant traits, 3 with each single dominant trait, and 1 with both recessive traits.

Q2: Does this assume independent assortment?
A: Yes, this calculation assumes the two genes are on different chromosomes or far enough apart to assort independently.

Q3: How would linked genes affect this?
A: Linked genes would deviate from these probabilities, producing more parental phenotypes and fewer recombinant phenotypes.

Q4: Can I use this for trihybrid crosses?
A: No, this calculator is specifically for dihybrid crosses. Trihybrid crosses would involve (3/4)^n × (1/4)^(3-n) probabilities.

Q5: What about incomplete dominance?
A: This calculator assumes complete dominance. Incomplete dominance would require different probability calculations.