MENDELIAN TERMS 103 



to recognize a " genotype " which inchides only such indi- 

 viduals as breed alike, i. e., which produce the same kind or 

 kinds of gametes. A single phenotype often includes two or 

 more categories of genotypes. Thus Fo dominants though 

 all may look alike (be of one phenotj-pe) regularh^ include 

 both homozygotes and heterozygotes (wholly distinct geno- 

 types). 



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