[Annals N. Y. Acad. Sct., Vol. XXI, pp. 87-117, pll. VII-IX. 5 July, 1911.] 



THE INFLUENCE OF HEKEDITY AND OF ENVIEONMENT 

 IN DETERMINING THE COAT COLORS IN MICE 



By T. H. Morgan 



CONTENTS 



Page 



Introduction 88 



Crosses between a wild sport of Mus musculus and domesticated varieties. 88 



Description of the wild sport 89 



Crosses between the wild sport and domesticated races with uniform 



coat 90 



Crosses between the sport and yellow mice 90 



Crosses between the sport and gray mice 92 



Crosses between the sport and black mice 92 



Crosses between the sport and chocolate mice 92 



Crosses between the sport and albinos 93 



Crosses between F 15 hybrid sports and yellows 93 



Crosses between F lf hybrid sports 93 



New type of gray with a yellow belly 93 



Crossing extracted gray and black to test the hypothesis of alternate domi- 

 nance and recession 94 



Crosses between the spotted and the uniform coat 95 



Influence of the spotted coat on the white belly of the sport 98 



Crosses between the black spotted waltzer and mice with chocolate coat. . . 100 



Artificial waltzers 102 



Are black and chocolate different pigments or stages in the development of 



the same pigment? 103 



Asymmetrical eye colors 104 



Dilute grays 104 



Crosses between black and white spotted waltzers and yellows 105 



A mauve-colored wild sport 106 



The influence of the environment on the color of Peromyscus leucopus am- 



modytes 106 



General conclusions 108 



The ticked or gray as a unit character , 108 



The association hypothesis Ill 



Unit characters and factors in Mendelian inheritance 114 



Literature 117 



(87) 



