Question

When a cross is made between a tall plant with yellow seeds $(Tt\, Yy)$ and a tall plant with green seeds $(Tt\, yy)$, what is true regarding the proportions of phenotypes of the offsprings in $F_1$ generation ?

	Proportion of Tall and Green	Proportion of Dwarf and Green
(a)	$\frac{3}{8}$	$\frac{1}{8}$
(b)	$\frac{2}{8}$	$\frac{1}{8}$
(c)	$\frac{1}{8}$	$\frac{3}{8}$
(d)	$\frac{2}{8}$	$\frac{2}{8}$

• A. a
• B. b
• C. c
• D. d

Answer 1

Answer: (A)

A cross between a tall plant with yellow seeds $(TtYy)$ and a tall plant with green seeds $(Ttyy)$ will be :

Pnenotypic ratio is :
Tall and yellow : Tall and green : Dwarf and yellow : Dwarf and green $:: 3 :3 :1 :1$ or $3/8$, $3/8$, $1/8$, $1/8$.