Question

In {{F}_{2}}
generation, a phenotypic ratio of 1:1:1:1 exhibits
A) Back cross
B) Monohybrid test cross
C) Lethality
D) Dihybrid test cross

Answer 1

 its D. In case of dihybrid test cross , the ratio is 1:1:1:1

Answer 2

Option (D) is the correct answer.

• The dihybrid test cross between the dihybrid F1 grains with the homozygous recessive parent generates the ratio of 1:1:1:1.
• F2 generation in a back cross showed that both genotypic and phenotypic ratios are the same as 1 : 2: 1.
• F2 generation in a monohybrid test cross showed that both genotypic and phenotypic ratios are the same as 1:1.
• The 2:1 ratio is the typical ratio for a lethality gene.

Hence, option (D) is the correct answer.