Question

A tall plant with red flower is crossed with a dwarf plant with white flowers.Work out a dihybrid cross and state the dihybrid ratio.

Answer 1

1:2:1:2:4:2:1:2:1 is the genotypic ratio of the F2 generation in a Mendelian dihybrid cross.

Answer 2

ANSWER:

The standard dihybrid ratio of the tall plant with red flower when crossed with dwarf plant with white flower is 9 :3 :3 :1  

EXPLANATION:

In the above dihybrid ratio the 9 represents the plants having both the dominant character among the F1 generation. The 3 represent the plant having one dominant trait and the other recessive trait.

The other 3 represent the plant having the first dominant trait and the other recessive trait. The 1 represent the plant having both recessive traits hence it is homozygous.

It can be predicted by the Mendel’s experiment for dominance and recessive genes. In this experiment two different types of genotype or heterozygous are used so that they can be easily identified in their F1 generation.