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THE AMEBIC AN NATURALIST [Vol. XLV 



where the curved variety is a dominant heterozygote and 

 the straight is a recessive homozygote. Such is the case, 

 for of the 31 families examined in which wavy is crossed 

 with straight or curly with straight, there are 157 chil- 

 dren of whom 84 have straight hair and 73 have hair curly 

 or wavy. Where the wavy and the curly are crossed, if 

 each is a heterozygote with the straight recessive, we 

 should expect to find three children with the curved 



