Alleles and Phenotypes in Co-Dominance

The video tutorial covers the concepts of incomplete and codominance, explaining how alleles interact in these genetic scenarios. It introduces Punnett squares as a tool for predicting genetic outcomes, with examples using flowers, mice, and chickens to illustrate incomplete and codominance. The tutorial provides step-by-step instructions on setting up Punnett squares and calculating phenotype probabilities.

What is the main difference between incomplete dominance and co-dominance?

• Incomplete dominance results in a blended trait, while co-dominance results in both traits being fully visible.

• Incomplete dominance results in one trait being completely dominant, while co-dominance results in a blended trait.

• Incomplete dominance results in both traits being fully visible, while co-dominance results in a blended trait.

• Incomplete dominance and co-dominance are the same.

In the example of incomplete dominance with flowers, what color is the heterozygous offspring?

• Red

• White

• Pink

• Striped

In co-dominance, what would be the appearance of a heterozygous offspring from a red and white flower?

• Red and white striped or spotted

• Completely red

• Red and white blended

• Pink

How are alleles represented in Punnett squares for incomplete and co-dominance?

• With symbols

• With lowercase letters

• With different capital letters for each allele

• With numbers

What is the phenotype of an organism with the genotype BW in co-dominance?

• Black

• White

• Gray

• Black and white spotted

In the example of mice with incomplete dominance, what percentage of offspring are expected to be cream-colored?

• 75%

• 100%

• 50%

• 25%

In the chicken example of co-dominance, what is the expected phenotype of the offspring?

• All white

• All black

• Half black, half white

• All black and white spotted

What is the genotype of a black chicken in the co-dominance example?

• BW or WW

• BB

• BW

• WW

In the example of mice, what is the genotype of a yellow mouse?

• WY

• WW

• YW

• YY

What is the expected phenotype ratio for the offspring of two cream-colored mice?

• All cream

• 3:1 for cream:white

• 1:1 for yellow:white

• 1:2:1 for yellow:cream:white