Question

In cattle, the coat color red ad white are two dominant traits, which express equally in $F_1$ to produce roan (red and white color in equal proportion). If $F_1$, progeny are self-bred, the resulting progeny in $F_2$ will have a phenotypic ratio (red: roan: white) as

• A. $1:1:1$
• B. $3:9:3$
• C. $1:2:1$
• D. $3:9:4$

Answer 1

The correct option is C $1:2:1$

• When the red coat color of cattle is crossed with white coat color cattle, the roan variety is produced. When the roan variety is self-bred, the progeny is obtained in the 1 red:2 roan:1 white.

• The genotypic and the phenotypic ratio are 1:2:1.

• So, the correct answer is option C.