42 Inheritance and Involution in Ortlioptcni IT 



The mating RP x S, (2), [>. {J5, could not have been othei- tliaa 

 FS<P X SS which would produce 



FS SS 



1 1 



Pea Single 



FSi> and SS<i> 

 1 1 



Walnut Rose 



Another case is that of comb behaviour in experiments 33, -iO and 41, 

 (1), pp. 103, 10(), 107. The ? in experiment 33 was well proven to 

 have been homozygous for the modifying factor «I> which makes ro.se of 

 single (experiments 30-33) and her composition therefore should read 

 *S'<t>iS'<t> and the J* was single (.^'<S'). A pedigree arrangement of these 

 experiments would appear as follows : 



These experiments 33, 40, and 41 of Bateson and Saunders are 

 exactly paralleled by matings (4U8) and (467) in Paratettix. 



If P and »S' represent the factors for pea and single respectively and 

 <J> the factor which modifies »SVS' to make the two kinds of rose and PP 

 and PS to make the four kinds of walnut, a revision of Bateson's 

 16-square diagram, (2), p. 75, to correspond with the one ioi- Par atetti.i: 

 may be made : 



P* 



s* 



S 

 p* 

 s* 



