F3 Generation Probability problem

WHAT DOES P, F1 AND F2 MEAN? When displaying crossings between two parental organisms, the resulting offspring are referred to as F1. If those offspring are crossed between themselves, the resulting generation is called F2. If two individuals of the F2 generation are crossed, they produce the F3 generation. The first crossing is always called P for “Parentes”. The F stands for “fili” meaning “sons” or “offspring”. The way of showing these crossings is useful to show inbreeding or to show the generations since a special crossing, for example a crossing between two inbred lines. In this system you can only cross within the same line. As soon as you introduce individuals that are not born from the P crossing, you will have to start over with the F-numbering. WHAT DETERMINES IF IT IS THE FIRST CROSSING (P)? That’s just what you decide. The first relevant crossing for your experiment is called P. Usually this means something significant, like the P generation has individuals from different breeding lines, geographical areas or have a certain inbred trait. Problem: In a cross the plants of F2 segregate 3/4 red and 1/4 white. If a red plant of the F2 has self-fertilized, what is the probability that both phenotypes will be observed in its progeny? #punnetSquare #Genetics #probability #productRule #statistics #F1 #F2 #F3