Table 4.

Recombinants between rl and cn within a group of chromosome 2 heterochromatic lethals

Lethals	Genotype	Allelism test
l(2Rh)IR40	b lt rl +	41Ad (Df)
l(2Rh)IRh41	b lt rl cn	rl
l(2Rh)IRh42	b lt rl cn	41Aa; rl; 41Ad (Df)
l(2Rh)IRh43	b lt rl cn	41Ah
l(2Rh)IRh46	b lt rl cn	41Ad
l(2Rh)IRh47	+ + + cn	41Ad (Df)
l(2Lh)IRh45	+ lt + +	Retains only 40Fc

IRh41, IRh42, IRh43, and IRh42 are associated with the b lt rl cn chromosomes; IRh40 and IRh47 are associated with the b lt rl + and + + + cn recombinant chromosomes, respectively; IRh45 is a deletion which is likely to be induced on the Charolles wild-type chromosome. (Df) = cytologically detectable deletions.