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.
NOTE: One of the reasons that Mendel carried out his breeding experiments with pea plants was that he could observe inheritance patterns in up to two generations a year. Geneticists today usually carry out their breeding experiments with species that reproduce much more rapidly so that the amount of time and money required is significantly reduced.