What is the difference between monohybrid and dihybrid cross

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The discussion clarifies the distinction between monohybrid and dihybrid crosses in genetics. A monohybrid cross involves a single trait, exemplified by homozygous parents such as yyTT and YYTT, while a dihybrid cross involves two traits. The specific example provided, YyTT x YYTT, does not qualify as either type of cross due to the presence of heterozygous genotypes. For accurate classification, only homozygous combinations should be used.

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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.
 
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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.
 
http://imgur.com/a/S09aJ i read this thing
 
i didn't understand it
 

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