dihybrid cross - hybridization using two traits with two alleles each. monohybrid cross - hybridization using a single trait with two alleles (as in Mendel's experiments with garden peas) reciprocal cross, reciprocal - hybridization involving a pair of crosses that reverse the sexes associated with each genotype.
From Wikipedia, the free encyclopedia. For other uses, see Red ribbon (disambiguation) . The red ribbon, as an awareness ribbon colored red, is used as the symbol for the prevention of abusive drug use and drunk driving and also solidarity of people living with HIV / AIDS.Contents.he red ribbon, as an awareness ribbon colored red, is used as the symbol for the prevention of abusive drug use and drunk driving and also solidarity of people living with HIV / AIDS. Contents.
Report Abuse. A yellow ribbon around a tree is meant as a reminder of all the soldiers who are away in combat or overseas. It is for their safe return. Military tradition often calls for either yellow or red items to symbolize homecoming and leaving.est Answer: This tradition is fairly new and was taken from the song by Tony Orlando and Dawn, tie a yellow ribbon round the old oak tree. This song is about a guy who went to prison and was getting released. He wanted his wife or girlfriend to tie the ribbon on the tree if she loved him and wanted him.