Why Does the Formula for Map Distance Between the Two

question 64

Essay

Why does the formula for map distance between the two outside genes in a three-point testcross count the double crossovers twice whereas the formula for the distance between an outside gene and the middle gene counts the double crossovers only once?

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Definitions:

Assumptions

Accepted beliefs or statements taken for granted without proof.

Observations

The act of noticing and recording something, often used as a method in scientific research to gather data.

Theory

A system of ideas intended to explain something, based on general principles independent of the thing to be explained.

Operational Definition

A statement of the procedures or ways in which a research concept, variable, or phenomenon is measured or experienced.