1. What is Phenotype Frequency?

Phenotype frequency refers to the proportion of individuals in a population that exhibit a particular phenotype. It is calculated by multiplying the genotype frequency by the expression level of that genotype.

2. How Does the Calculator Work?

The calculator uses the phenotype frequency equation:

Where:

• \( genotype\_freq \) — Frequency of the genotype in the population (0 to 1)
• \( expression \) — Degree to which the genotype is expressed as the phenotype (0 to 1)

Explanation: The equation accounts for both the prevalence of a genotype and how consistently it produces the observable trait.

3. Importance of Phenotype Frequency Calculation

Details: Calculating phenotype frequency is essential for understanding trait distribution in populations, studying evolutionary processes, and analyzing genetic disorders.

4. Using the Calculator

Tips: Enter genotype frequency (between 0 and 1) and expression level (between 0 and 1). Both values must be valid proportions.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between genotype and phenotype frequency?
A: Genotype frequency refers to genetic makeup prevalence, while phenotype frequency refers to observable trait prevalence.

Q2: What does an expression value of 0.5 mean?
A: It means the genotype produces the phenotype in 50% of individuals who have that genotype.

Q3: How is this different from penetrance?
A: Penetrance is a special case of expression where the phenotype is either present (1) or absent (0).

Q4: Can phenotype frequency exceed genotype frequency?
A: No, since expression ≤ 1, phenotype frequency ≤ genotype frequency.

Q5: When would phenotype frequency equal genotype frequency?
A: When expression = 1 (complete penetrance/expression).