Question

The phenotypic ratio of trihybrid cross in $F_2$-generation is?

• A. $27:9:9:9:3:3:3:1$
• B. $9:3:3:1$
• C. $1:4:6:4:1$
• D. $27:9:3:3:9:1:2:1$

Answer 1

The correct option is A $27:9:9:9:3:3:3:1$

• A cross between two individuals that are heterozygous for three different traits is called a trihybrid cross. Consider a cross of $F_2$ generation between organisms with genotype AaBbCc.
• As shown in the figure the phenotypic ratio of a trihybrid cross in $F_2$ generation will be 27:9:9:9:3:3:3:1.
  Thus the correct answer is option A.