S. (\ Haklani) 117 



It will now be conHidered whothor tlu* iminbur •>! liiiiiilit-h f«>ll«)win^' 

 the different ty|K»« of bt^haviour Ih in Jiceoniance with theory. A com- 

 parison of the observefi and ex|)«'ct«'<l resultH Ih given just above. 



The nmin featun' «»f the above n»HuItjH '\h thr <iifference in the 

 numb(*r of families .s«»jrit»^itin^ int^» bmwn and numMin and brown and 

 ixmI n'8|)e<'tivt'ly. Thesr .should hv «M|ual in inimbcr wht're;us those 

 which follow the ft>nner ty|H' of behaviour an* nion* than double tho.M<' 

 which are of the latti^r tyiK\ Sinee. however, the h\ reaultH as a whole 

 confirm the two factor hyjH)the8is, it is rea.sonable to Huppf»8e that tho 

 deviation is due to tluct nation. 



At this [K>int it may Ix' observed that the meaning of the various 

 i^hntles of colour found in F., Ix'came a littli' clearei- by observation of 

 the F3 families. The observations may be sinnmari/ed us follows: 



1. The brown which seiriegated into brown an<l mariMin. oi- into 

 bi-own man>on and red, wjus slightly tinged with purple. 



2. The bn»wn which si^*gregatt<l into brown and red was very jjiile 

 and devoid of purple. Then- w.us apparently no difi'orence between 

 Nm Nm. and Nm nm. 



.*!. The darkest shade of maroon was always homozygous. The 

 intenneiliate maroon segregated into daik maroon, intermediate maroon 

 and red in the 1:2:1 ratio. 



Suminari/ of Investigations on the Inlieritance of Pattern Colom: 



1. The black iwittern colour of the vaiiety Black ey<' is due to a 

 single factor B, which is dominant to its absence. 



2. The factoi*s involved in a cross between biown and red are two 

 in number. These are N — a t'actoi- which causes the production of 

 brown, an<l M — a factor which produces a maroon colour. N is <lomi- 

 nant over M. In the absence of both factors the seed coat is re<l. N 

 and M are indejxmdent of each other in inheritance. 



lieldtion of Flower Colour to Pattern of the Seed Coat. 



In the cro.sses between S(>lid and Small eye, it was noticed that a 

 genetic correlation existed betwien pattern and flower colour. Thus 

 plants c<mtaining the Watson factor were always dark flowered. Plants 

 with no Watson factor, i.e. the Holstein and Small eye types, weic p.ile 

 tlowered. It may be concluded that Dark flowei- and Watson pattein 

 are both manifesUitions of a single fact<a'. 



If the flower is white there is no pattern on th(? seed coat. In a 

 cross between Black eye and a white .seeded type (Para), th«' /-', was 

 Black Solid and in F.. segregation occun-e(l into Black Solid, lilack 



