Mendelian Ratio Calculator

Formula

The formula to calculate the Mendelian Ratio (MR) is:

\[ \text{MR} = \left(\frac{A}{T}\right) : \left(\frac{B}{T}\right) : \left(\frac{C}{T}\right) : \left(\frac{D}{T}\right) \]

Where:

\(\text{MR}\) is the Mendelian ratio
\(A\) is the number of offspring with the first combination of traits
\(B\) is the number of offspring with the second combination of traits
\(C\) is the number of offspring with the third combination of traits
\(D\) is the number of offspring with the fourth combination of traits
\(T\) is the total number of offspring

Mendelian Ratio Definition

A Mendelian ratio refers to the predictable patterns of inheritance observed by Gregor Mendel in his genetic experiments with pea plants in the 19th century. These ratios, such as the 3:1 ratio seen in monohybrid crosses or the 9:3:3:1 ratio seen in dihybrid crosses, represent the statistical probability of offspring inheriting a particular combination of traits from their parents. These ratios are foundational principles in the field of genetics.

Example Calculation

Let's assume the following values:

Number of offspring with the first combination of traits (A) = 90
Number of offspring with the second combination of traits (B) = 30
Number of offspring with the third combination of traits (C) = 30
Number of offspring with the fourth combination of traits (D) = 10

Using the formula:

\[ \text{MR} = \left(\frac{90}{160}\right) : \left(\frac{30}{160}\right) : \left(\frac{30}{160}\right) : \left(\frac{10}{160}\right) = 0.56 : 0.19 : 0.19 : 0.06 \]

The Mendelian Ratio (MR) is 0.56 : 0.19 : 0.19 : 0.06.