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.
These principles were first explained by Gregor Mendel, an Augustinian friar and scientist from Moravia, in the 1850s. Mendel performed experiments using common pea plants. He observed inheritance patterns that arose when he mated, or crossed, parents with known genetic traits, and then allowed subsequent generations of offspring to self-pollinate.