MendeVs Explanation 



TALL SMOOTH YELLOW 



245 



27 (Dominant for all traits) 



Such recombinations of traits has been demonstrated for 

 hundreds of characters in many different species of plants 

 and animals (Fig. 63). 



Mendel's Explanation 



The segregation of traits in the offspring of self- 

 fertilized hybrids give mathematically consistent results. 

 This fact led Mendel to the conclusion that whatever it is 

 that determines the appearance of a character becomes seg- 

 regated in the formation of the gerin cells. He assumed, for 

 example, that the tg^ cells from a yellow-seeded parent carry 

 something that determines yellowness in the seed of the 

 offspring; and that the sperm of a yellow-seeded parent 

 carries something that determines yellowness. And simi- 

 larly for green seed and for other characters. When the 

 hybrids produce eggs and sperms, each germ cell carries only 

 one determiner. There are therefore two kinds of tg^ 

 cells and two kinds of sperm cells, one kind of each carrying 

 the determiner for the dominant trait and one kind carrying 

 the determiner for the recessive trait (see Fig. 64) . These 

 assumptions would correspond with the actual results of the 

 breeding experiments. 



As a result of his years of experimentation Mendel 

 concluded: 



