SEGREGATION IN HEREDITY. 



it; 



slenderness and thus that condition reappears in the offspring; but 

 slender parents rarely carry gametes for fleshiness I p, 



2. As a corollary of the above, regression takes place in the pi 

 of fleshy parents to a markedly greater degree than in the progen; 



slender parents (p. 39). 



3. The progeny of heterozygous parents are significantly more vari- 

 able than the progeny of parents belonging respectively to slender 

 and to fleshy stock. This is evidence that the heterozygous pan 

 carry a greater variety of gametes than those of "purer stock." 



4. In different matings of the same type the variability of the 

 progeny differs; apparently, because some parents belong to a special 

 biotype and others simulate the biotype merely through heterozyg 

 ity. Thus, if the M X M mating be considered (table X), one finds 

 some families characterized by slight variability of the offspring. The 

 indices of build (English) in such families are given in table 34. 



Table 34. — Indices of build of the progeny of M x M matings, in which the parents belong 



to the M biotype. 



Reference. 



Indices of build of children. 



Mid rang*. I Total range. 



Bat 2 32, 33, 33, 35 



Boa 7 31, 32, 32, 34 



Die 4 29, 31, 32, 33 



Kel 4a 31, 32, M, M, M, 34 



Old 2 | 33, 33, 33,'35 



Rig 1 30, 32, 32, 34 



War 3 30, 30, 30, 31, 32, 32, 32, 33, 33, 36. 



33 



a 



8 

 i 

 a 



8 



The slight fluctuation in build of progeny of table 34 is obvious. 

 The modal index of the progeny is close to 33. On the other hand, 

 there are matings of this type which show a much greater variability. 

 These are listed in table 35. 



Table 35. — Indices of build of the progeny of M X M matings in which the pmmtt are 



probably heterozygous. 



Reference. 



Indices of build of children. 



Mi.l r:n.. in<*. 



Cas 4 . . . 

 Coo 5... 



Eat A... 

 Fis2.... 



mi.... 



Mar 22.. 

 Mer 8 . . . 

 Nes 1 . . . 

 Tet A... 

 Rup 1... 

 Smi 33 . . 

 Sto 13 . . . 

 A 01 : 29 



32, 34, 34, 37, 41, 43 



31, 33, 35. 36, 36, 36, 37, 37, 38, 38, 41 



33, 34, 35, 36, 36, 38, 38, 42 



33,35,37, 37, 37, 39, 40 



33, 34, 35, 35, 37, 37, 38, 39 



31, 32, 33, 36, 36, 40 



33, 36, 37, 40, 41 



32, 33,33, 37, 41, 51 



30, 30, 36, 41,43,49,49 



30, 30, 31, 31, 33, 36, 38, 40 



31, 31, 32, 36, 36, 36, 36, 37 



33, 34, 36, 38, 38, 38 



29, 39, 41 



II B 



11 

 10 







7 



8 



e 



B 



19 

 19 







5 



U 



