Unraveling Incomplete Dominance Through Snapdragon Flower Color Genetics

The video explains incomplete dominance, where neither allele is completely dominant, resulting in an intermediate phenotype. Examples include snapdragon flower color and chicken feather color. The video also covers phenotypic ratios in the F2 generation and the role of genes and alleles in trait expression.

What is incomplete dominance?

• A situation where neither allele is completely dominant over the other

• A situation where one allele completely masks the other

• A situation where alleles do not affect the phenotype

• A situation where both alleles are equally expressed

In the snapdragon example, what is the phenotype of the F1 generation when a red flowered plant is crossed with a white flowered plant?

• White

• Pink

• Red

• Blue

What is the phenotypic ratio observed in the F2 generation of snapdragons?

• 3 red: 1 white

• 1 red: 1 pink: 2 white

• 2 red: 1 pink: 1 white

• 1 red: 2 pink: 1 white

Why do pink flowers appear in the F1 generation of snapdragons?

• Due to incomplete dominance and intermediate pigment production

• Due to blending of red and white pigments

• Due to mutation in the pigment gene

• Due to complete dominance of one allele

In the chicken example, what color are the offspring when splashed white and black feathered birds are crossed?

• Black

• White

• Red

• Slate blue

What is the phenotypic ratio observed in the F2 generation of chickens?

• 1 white: 1 blue: 2 black

• 3 blue: 1 black

• 2 white: 1 blue: 1 black

• 1 white: 2 blue: 1 black

What does each gene contain information for?

• Producing no traits

• Producing multiple traits

• Producing a specific trait

• Producing random traits

In a diploid organism, how many copies of each gene are present?

• One

• Two

• Three

• Four

What can a modified allele be responsible for in terms of enzyme production?

• Producing a less efficient or non-functional enzyme

• Both B and C

• Producing a more efficient enzyme

• Producing no enzyme at all

What is the role of alleles in heterozygotes?

• They are always identical

• They may differ and affect trait expression

• They do not affect trait expression

• They are always dominant