You are here : / / / 6 Reasons Why Your Gums are Bleeding. If you regularly see red when you brush your teeth, it could be cause for concern. Here's why your gums are bleeding ' and what to do about it. Jackie Middleton.
Between 1856 and 1863 Mendel cultivated and tested some 29,000 pea plants (Pisum sativum). This study showed that one in four pea plants had purebred recessive alleles, two out of four were hybrid and one out of four were purebred dominant.
The dominant traits in Mendel's pea plants were green pea pods (G) and round peas (R). There are three times as many green pea pods and round peas than yellow pea pods and round peas, because the ratio predicted by the law of independent assortment is 9:3:3:1, and this question addresses the first two numbers (9:3).