Phenotypic Ratios in Flower Genetics

The video tutorial explains incomplete dominance using four o'clock flowers. It demonstrates how to set up a Punnett Square to cross red and white flowers, resulting in an F1 generation of all pink flowers. The tutorial then crosses the F1 generation to produce an F2 generation with a 1:2:1 ratio of red, pink, and white flowers, illustrating the concept of incomplete dominance.

What is the main concept illustrated by the four o'clock flower example?

• Complete dominance

• Incomplete dominance

• Co-dominance

• Epistasis

What is the genotype of the white four o'clock flower used in the cross?

• CRCR

• CWCW

• CCWW

• CRCW

What is the expected phenotype of the F1 generation when a red flower is crossed with a white flower?

• Red and white

• All pink

• All white

• All red

What is the phenotypic ratio of the F2 generation when two pink flowers are crossed?

• 1 red: 1 pink: 1 white

• 1 red: 2 pink: 1 white

• 1 red: 1 pink: 2 white

• 2 red: 1 pink: 1 white

What does the F2 generation reveal about the nature of the alleles involved?

• Both alleles are recessive

• Neither allele is dominant

• The white allele is dominant

• The red allele is dominant