Question

When a cross is made between tall plant yellow seeds (TtYy) and tall plant with green seed (Ttyy), what proportion of phenotype in the offspring could be expected to be: (i) tall and green (ii) dwarf and green

Answer 1

Parents: TtYy * Ttyy
(Tall plant. (Tall plant
yellow seed ). green seed)
Gamete: TY Ty tY ty Ty Ty ty ty

F1:. TY Ty tY ty

Ty. TTYy. TTyy. TtYy. Ttyy

Ty. TTYy. TTyy. TtYy. Ttyy

ty. TtYy. Ttyy. ttYy. ttyy

ty. TtYy. Ttyy. ttYy. ttyy


(i) Tall plant and green seed: ( TTyy and Ttyy ) : 6/16*100 = 37.5%

(ii) dwarf plant and green seed: (ttyy ) 2/16*100=12.5%

Answer 2

Parents: TtYy * Ttyy

(Tall plant. (Tall plant

yellow seed ). green seed)

Gamete: TY Ty tY ty Ty Ty ty ty

F1:. TY Ty tY ty

Ty. TTYy. TTyy. TtYy. Ttyy

Ty. TTYy. TTyy. TtYy. Ttyy

ty. TtYy. Ttyy. ttYy. ttyy

ty. TtYy. Ttyy. ttYy. ttyy

(i) Tall plant and green seed: ( TTyy and Ttyy ) : 6/16*100 = 37.5%

(ii) dwarf plant and green seed: (ttyy ) 2/16*100=12.5%