What is the difference between monohybrid and dihybrid cross

[rashida564]

and if I have two plants the first one with a genotype of YyTT and the second one with a genotype of yyTT fertilise them this would be a monohybrid or dihybrid cross.

 

[jim mcnamara]

The definition of both monohybrid & dihybrid is 'cross between homozygous parents...'
So yyTT YYTT does not involve T because TT and TT are the same, YY is homozygous, yy is homozygous, this is one trait == monohybrid

So the answer to your question is: YyTT x YYTT is neither. It needs to be either yyTT x YYTT, or yyTT x yytt - homozygous only, no Yy and no Tt.

 

[rashida564]

http://imgur.com/a/S09aJ i read this thing

 

[rashida564]

i didn't understand it