10 



INHERITANCE IN CANARIES. 



Table 2. — To Test the Purity of Cresied Parents. 



[Leg-band numbers in italics indicate non-crested birds. Arbitrary signs employed in this table 

 have the same meaning as in table 1.] 



Inspection of table 2 shows that at least 2 birds are homozygous in 

 crest, viz., No 12 (female), which has produced 9 young, all crested, 

 and No. 79 (male), which has produced 11 young, all crested. Also 

 No. 126 (female) (Experiment 706) is possibly homozygous. No. 9 

 (male) has produced an unexpectedly large proportion of crested, viz., 

 16: 1, where 12.75:4.25 was to be expected; mated with No. 6 (female), 

 No. 79 (male) was produced which is, as just stated, homozygous. 



When two heterozygous crested (DR) parents are mated 25 per 

 cent of the offspring should be non-crested. Eliminating the offspring 



