Which interaction demonstrates the lack of complete dominance?

Which interaction demonstrates the lack of complete dominance?

• A. Blue and green flower colors producing only blue flowers
• B. Red and white flowers producing pink flowers
• C. Brown and black fur producing only black fur
• D. Long and short tails yielding only short tails

Answer: (B)

The interaction that exemplifies the lack of complete dominance is when red and white flowers produce pink flowers. This phenomenon is known as incomplete dominance, where neither allele is completely dominant over the other. As a result, the heterozygous phenotype is a blend of the two parental traits, leading to the production of pink flowers that are distinguishable from both the red and white flower colors. In contrast, the other scenarios provided illustrate complete dominance, where one trait completely overshadows the other. In the case of blue and green flower colors producing only blue flowers, blue is the dominant trait, completely masking the expression of the green. Similarly, brown and black fur producing only black fur indicates that black is dominant, while long and short tails yielding only short tails suggests that short is the dominant trait that is fully expressed over long. Thus, the occurrence of pink flowers from red and white parents serves as a clear example of incomplete dominance, showcasing a blending of traits rather than the dominance of one over the other.

The interaction that exemplifies the lack of complete dominance is when red and white flowers produce pink flowers. This phenomenon is known as incomplete dominance, where neither allele is completely dominant over the other. As a result, the heterozygous phenotype is a blend of the two parental traits, leading to the production of pink flowers that are distinguishable from both the red and white flower colors.

In contrast, the other scenarios provided illustrate complete dominance, where one trait completely overshadows the other. In the case of blue and green flower colors producing only blue flowers, blue is the dominant trait, completely masking the expression of the green. Similarly, brown and black fur producing only black fur indicates that black is dominant, while long and short tails yielding only short tails suggests that short is the dominant trait that is fully expressed over long.

Thus, the occurrence of pink flowers from red and white parents serves as a clear example of incomplete dominance, showcasing a blending of traits rather than the dominance of one over the other.