ALTERNATIVE INHERITANCE 21 



race, patterned white larva, white cocoon. Two-thirds of the young 

 were blended zebra and patterned larvae, and one-third were patterned 

 white larvae. 



In the first case the starveling male was undoubtedly a homo- 

 zygote; in the second case a heterozygote. In the first case the weak 

 condition of the starveling male did not affect or modify in any degree 

 the characteristic dominance of the zebra over the white larval type. 

 In the third case there seems to be an interesting varying from the 

 Mendelian or alternative type of inheritance to an unmistakable and 

 perfect blending in the eggs of two-thirds of the progeny. 



In 1905 another set of experiments along this line of testing the 

 prepotency of vigor and sex was made. The following examples of 

 these matings and their results may be referred to: 



A male starveling, Italian Salmon, zebra larva, salmon cocoon, 

 mated with a vigorous female, Bagdad race, white larva, white cocoon. 

 Offspring all zebra larvae ; cocoons showing many shades of color from 

 greenish white through salmon and dull yellow to golden yellow. 



A male starveling, Italian Salmon, zebra larva, salmon cocoon, 

 mated with vigorous female, Bagdad, white larva, white cocoon. Off- 

 spring were all zebra larvae. 



A male starveling, Italian Salmon, zebra larva, salmon cocoon, 

 mated with vigorous female, Bagdad, white larva, white cocoon. Off- 

 spring were 133 zebra larvae and 129 white larvae. Cocoons all salmon. 



A vigorous male, Italian Salmon, zebra larva, salmon cocoon, 

 mated with female starveling, Bagdad, white larva, white cocoon. 

 Offspring all zebra larvae ; cocoons all white. 



A male, vigorous, Italian Salmon, zebra larva, salmon cocoon, 

 mated with female starveling, Bagdad, white larva, white cocoon. Off- 

 spring all zebra larvae ; cocoons of several shades from yellowish salmon 

 to strong golden yellow. 



A male starveling, Bagdad, white larva, white cocoon, mated 

 with female, vigorous, Italian Salmon, zebra larva, salmon cocoon. 

 Offspring all zebra larvae ; cocoons 78 white and 71 salmon. 



A male, vigorous, Italian Salmon, zebra larva, salmon cocoon, 

 mated with female starveling, Bagdad, white larva, white cocoon. Off- 

 spring all zebra larvae ; cocoons 63 white and 65 salmon to yellowish 

 salmon. 



A male, vigorous, Italian Salmon, zebra larva, salmon cocoon, 

 mated with female starveling, Bagdad, white larva, white cocoon. Off- 

 spring all zebra larvae, cocoons Yz salmon and ^ white. 



