Non-Mendelian Genetics Quiz

1. 1. What phenotype results from a cross between a red (RR) and a white (WW) snapdragon flower?

• A. White

• B. Roan

• C. Red

• D. Pink

2. 2. Why does incomplete dominance produce a blended phenotype?

• A. Both alleles contribute partially

• B. Both alleles cancel each other out

• C. One allele is dominant and overrides the other

• D. Both alleles are silent

3. 3. What genotypic ratio is expected from a cross of two pink (RW) snapdragons?

• A. 1:2:1

• B. 2:1:1

• C. 3:1

• D. 1:1

4. 4. How does incomplete dominance differ from Mendelian dominance?

• A. It skips generations

• B. It results in blending of traits in heterozygotes

• C. It shows clear dominant-recessive relationships

• D. It only occurs in animals

Which offspring result from crossing a red and a pink snapdragon?

• A. All pink

• B. 75% red, 25% pink

• C. 50% red, 50% pink

• D. All red

What conclusion can be drawn from the pink phenotype in RW snapdragons?

• A. W is fully dominant

• B. R is not expressed

• C. The genes mutate during reproduction

• D. Both alleles contribute partially

How can you identify incomplete dominance in a phenotypic pattern?

• A. The heterozygote expresses a completely new phenotype

• B. There are only two phenotype types

• C. The phenotype is absent

• D. The heterozygote resembles one parent

Why are traits like flower color in snapdragons ideal examples of incomplete dominance?

• A. They are difficult to observe

• B. They involve only dominant alleles

• C. They show a blend of parent traits in offspring

• D. The colors are simple

When can incomplete dominance be ruled out?

• A. When heterozygotes look identical to one parent

• B. When multiple alleles are involved

• C. When the phenotype is unpredictable

• D. When the offspring has traits from both parents

What happens if a white (WW) flower is crossed with a pink (RW) flower?

• A. 50% white, 50% pink

• B. 50% pink, 50% red

• C. All pink

• D. All white