in a particular plant species, majority of the plants bear purple flowers. Very few plants bear white flowers. No intermediate colours are observed. If you are given a plant bearing purple flowers, how would you ascertain that it is a pure breed for that trait???? plz explain.....
To establish whether the sample is a pure breed or not, test cross would have to be carried out. The sample will be crossed with a recessive white flower sample. If the test cross yeilds all purple flowers then it is a pure breed else heterozygous.