هذي قطع امثله الاختبارات محاضره 10 وراح انزل اشياء مهمه انتظروني
Gregor Mendel was the first person to make precise observations
about the biological mechanism of inheritance. This happened a little
over 100 years ago in Austria, where Mendel spent his leisure hours
performing experiments with pea plants of different types. He crossed
them carefully and took notes about the appearance of various traits,
or characteristics, in succeeding generations. From his observations,
Mendel formed a set of rules, now known as the Mendelian Laws of
Inheritance, which were found to apply not only to‘ plants but to
animals and human beings as well. This was the beginning of the
modern science of genetics.