550 



HEREDITY 



drought, and cold; and many others have been found to follow 

 Mendel's law. Among live stock Mendelism applies to numerous 

 characters, such as the presence or absence of horns in cattle, the 

 color of the hair in cattle and horses, the character of the comb 



m 



Ji 



Fig. 479. — Mendelism demonstrated in the inheritance of color in the 

 endosperm of Com. c, ear bearing the Fi kernels of the cross between a 

 (white endosperm) and 6 (yellow endosperm), showing dominance of yellow, 

 d, ear bearing Fi kernels of the cross, showing segregation of color. After East. 



and feathers ia chickens, etc. In man many characters, among 

 which are insanity and susceptibility to tuberculosis, are known 

 to behave according to Mendel's law, and Eugenics, which has 

 to do with applying the laws of heredity to mankind with the 

 idea of improving the human race physically and mentally, has 

 its chief support in Mendelism. 



Mendel's discoveries have already enabled us to make some 

 notable achievements in the way of improving plants and ani- 



