Phenotype distributions with additive genes

The parents producing progeny in each example are heterozygous for each gene. The color-contributing alleles are designated as 1 for each gene. The number of F2 phenotype categories increases with the number of additive genes (1 of 6)The parents producing progeny in each example are heterozygous for each gene. The color-contributing alleles are designated as 1 for each gene. The number of F2 phenotype categories increases with the number of additive genes (1 of 6)

(a) One locus: AA, x A,A, Number of color-producing alleles 2 l 0 E 0.50 0 3 0.40 E 0.30 =5 0.20 3. 0.10 S o. .L .1. .L 4 2 4 Progeny proportion (b) Two loci: A,A‘,B,BI x A,A,8,82 Number of color-producing alleles 4 3 2 1 0 E050 E040 c: 0.30 €0.20 .1 go 0 A .1. .4. .§. .9. .1. 16 16 16 16 16 Progeny proportion (6) Three loci: A,A,B,8,C,C, x A,A,B,B,C,C, Number of color-producing alleles 6 5 4 3 2 1 0 Progeny frequency .0 .0 .° .° - N w 8 O O O .1. .5. 15 29 15 .6. .1. 64 64 64 64 64 64 64 Progeny proportion (61) Four loci: A,A,s,s,c,c,o,o, x A,A,B,e,c,c,o,o, Number of color-producing alleles 8 7 6 5 4 3 2 1 0 E 0.40 0 g 0.30 E 0.20 u 0.10 5‘ m L .8. 3.8. 5.6. 10 £6. .29. .8. L 256 256 256 256 256 256 256 256 256 Progeny proportion (9) Five loci: A,A,8,8,C,C,D,D,E,E, x A,A,B,8,C,C,D,D,E,E, Number of color-producing alleles 109876543210 50.30 Progeny frequ (y .0 .0 —h N o o 1 10 45 120210 252 210120 45 10 1 10241024102410241024102410241 024102410241024 Progeny proportion