8 A MANUAL OF MENDELISM 



of seed, the second to colour of albumen, the third to 

 colour of seed-coat. 



Round Round Round Wrnkld. Round Wrnkld. Wrnkld. Wrnkld. 

 yellow yellow green yellow green yellow green green 

 clrd. white clrd. elrd. white white clrd. white 



269 98 86 88 27 34 30 7 



ie. 27:9:9:9:3:3:3:1 



But this result again raised the question : How many 

 of the hybrids' progeny were hybrids and how many 

 bred true ? To answer it, the 639 plants were all bred 

 from, and, although they now consisted of eight groups, 

 it was again found that each group contained equal 

 numbers of true-breeding individuals. The following 

 are the actual numbers in each group which bred 

 true : 



Round Round Round Wrnkld. Round Wrnkld. Wrnkld. Wrnkld. 



yellow yellow green yellow green yellow green green 



clrd. white clrd. clrd. white white clrd. white 



8 14 9 8 11 10 10 7 



As in the previous experiment, four results are again 

 to be noted, namely : 



(a) The hybrids' progeny consist of eight groups. 



(b) These eight groups are numerically to each other 

 in the ratio 27 : 9 : 9 : 9 : 3 : 3 : 3 : 1. 



(c) Each group contains equal numbers of true- 

 breeding individuals. 



(d) Since the dominant and the recessive members of 

 a pair of characters cannot appear together on the 

 same plant, the characters borne by the eight groups of 

 hybrids' progeny represent every possible combination 

 of the six parental characters taken three at a time. 



