Dihybrid Cross and Phenotypic Ratios

The video tutorial explains the dihybrid cross involving two parent plants with different traits: yellow and round seeds versus green and wrinkled seeds. It covers the F1 generation, where dominant traits mask recessive ones, resulting in yellow and round seeds. The F2 generation is discussed, showing various genetic combinations and their phenotypic outcomes. The phenotypic ratio of 9:3:3:1 is calculated, illustrating the inheritance of two characters. The tutorial concludes with a summary of the dihybrid cross process.

What are the traits of the first parent plant in the dihybrid cross?

• Green and wrinkled

• Green and round

• Yellow and round

• Yellow and wrinkled

Which traits are represented by capital letters in the dihybrid cross?

• Recessive traits

• Dominant traits

• Mutant traits

• Intermediate traits

What is the genotype of the F1 generation in the dihybrid cross?

• Yyrr

• YyRr

• yyRR

• YYRR

In the F1 generation, which trait is dominant?

• Green and wrinkled

• Yellow and round

• Yellow and wrinkled

• Green and round

How many different phenotypes are observed in the F2 generation?

• 5

• 2

• 3

• 4

What is the phenotypic ratio of the F2 generation?

• 9:3:3:1

• 3:1

• 2:2:1

• 1:1

Which combination results in green and round seeds in the F2 generation?

• YYRR

• yyRr

• yyrr

• Yyrr

What is the genotype for yellow and wrinkled seeds in the F2 generation?

• Yyrr

• YyRr

• YYrr

• yyRR

Which genotype results in green and wrinkled seeds?

• YYRR

• YyRr

• yyrr

• YYrr

What concept does the dihybrid cross illustrate?

• Natural selection

• Mutation of genes

• Inheritance of two traits

• Inheritance of a single trait