Labeled diagram: Punnett square for incomplete dominance examples.

📚 Quick Study Guide

• 🧬 Incomplete dominance occurs when neither allele is fully dominant, resulting in a blended phenotype in heterozygotes.
• 🌸 Example: A red flower ($RR$) crossed with a white flower ($WW$) produces pink flowers ($RW$).
• 📝 Genotype ratios from a Punnett square predict phenotype ratios in the offspring.
• 🧮 A Punnett square is a table that lists all possible combinations of alleles from the parents.
• 💡 Remember to identify the genotypes of the parents correctly before setting up the Punnett square.

🧪 Practice Quiz

1. What is the phenotype of a flower with the genotype $RW$ if red ($R$) and white ($W$) exhibit incomplete dominance?
   1. Red
   2. White
   3. Pink
   4. Red and White striped
2. In incomplete dominance, if a homozygous red flower ($RR$) is crossed with a homozygous white flower ($WW$), what percentage of the offspring will be pink ($RW$)?
   1. 0%
   2. 25%
   3. 50%
   4. 100%
3. If two pink flowers ($RW$) are crossed, what is the probability of producing a white flower ($WW$)?
   1. 0%
   2. 25%
   3. 50%
   4. 75%
4. Which of the following is NOT a characteristic of incomplete dominance?
   1. A blending of traits in heterozygotes
   2. Both alleles are equally expressed
   3. One allele is completely dominant over the other
   4. The heterozygote phenotype is distinct from both homozygous phenotypes
5. In shorthorn cattle, red coat color ($RR$) and white coat color ($WW$) exhibit incomplete dominance. What coat color would a heterozygous ($RW$) cow have?
   1. Red
   2. White
   3. Roan (mixture of red and white hairs)
   4. Black
6. If you cross a pink snapdragon ($RW$) with a white snapdragon ($WW$), what percentage of the offspring will also be white?
   1. 25%
   2. 50%
   3. 75%
   4. 100%
7. What type of cross results in a 1:2:1 phenotypic ratio when incomplete dominance is involved?
   1. $RR$ x $RR$
   2. $WW$ x $WW$
   3. $RW$ x $RW$
   4. $RR$ x $WW$