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.
Mendel studied seven traits that are specific to garden peas. Seed shape, seed color, flower color, flower position, pod color, pod shape and plant height. Although he studied seven traits, he only studied one trait at a time to control variables and analyze his data mathematically. Mendelâs first crosses were called monohybrid crosses. He started with a set of tall pea plants, from generations that had produced tall plants.