Sometimes just a few individuals that migrate to an island, thus becoming isolated from the parent species, develop into a new species. 有時(shí)，正是移居到某一個(gè)島上的幾個(gè)個(gè)體，由于脫離了它們親代，因而發(fā)育成為一個(gè)新種的。
Mendel deduced that this result was possible only if each individual possesses only two hereditary units, one from each parent. 只有在每個(gè)個(gè)體僅擁有兩個(gè)研究遺傳單元，并每個(gè)單元來(lái)自一個(gè)親代時(shí)，實(shí)驗結果才成立。
