trihyrid test cross

Dear student,
Please find below the solution to the asked query

The cross betwen F1 individual and its recessive parent is called test cross. 
Let us explain this cross with an example of trihybrid cross between Tall pea plant with Round and Yellow seeds (TTRRYY) and Dwarf pea plant with Wrinkled and Green seeds (ttrryy). 
Here the test cross with three characters (trihybrid cross) is made between heterozygous F1 and recessive parent. 


Thus, phenotypic ratio of 1/8 of every possible phenotype is obtained.
 

 
Regards

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