The phenotypic and genotypic ratios of a dihybrid cross can be derived using a branched-line method

The phenotypic and genotypic ratios of a dihybrid cross can be derived using a branched-line method instead of a Punnett square.


F2 Genotypic ratio
1/4 yy —> 1/16 SSYY
1/4 55 < 2/4 yy —>2/16 SSYy
1/4 yy —> 1/16 SSyy
1/4 YY —> 2/16 SsYY
Sst Sst 2/4 55 < 2/4 Yy —> 4/16 Sst
1/4 yy —> 2/16 Ssyy
1/4 yy—> 1/16SSYY
1/4 55 < 2/4 Yy —>2/16 sst
1/4 yy —> 1/16 ssyy
F2 Phenotypic ratio
3/4 Y —>9/16 Smooth Yellow
3/4 S <
1/4 y —>3/16 Smooth green
SSYy Sst
3/4 Y —>3/16 wrinkled Yellow
1/4 5 <
1/4 y —>1/16 wrinkled green
enengege Lear/Mg. All Rrghls Reserved.