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Understanding Incomplete Dominance and Environmental Influence on Phenotype

Incomplete dominance is a genetic phenomenon where neither allele is fully dominant, resulting in a blended phenotype. For example, crossing red and white flowers produces pink flowers. The environment plays a crucial role in shaping an organism's phenotype by influencing gene expression. A specific environmental condition, like an exceptionally hot spring, may cause lighter wing pigmentation in the western white butterfly. This dynamic interaction between genetics and environment is essential for understanding variations in traits.

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Understanding Incomplete Dominance and Environmental Influence on Phenotype

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  1. p. 321 A.Q. 1a, 2ab, 3

  2. p. 321 A.Q. 1a, 2ab, 3 1a. What does incomplete dominance mean? Give an example. 1a. In incomplete dominance, neither of two alleles is dominant. The phenotype is a blend of the two alleles, such as pink flowers from red and white parents. RW WW RR

  3. p. 321 A.Q. 1a, 2ab, 3 2a. What is the relationship between the environment and phenotype? 2a. The relationship between the environment and phenotype is that the environment affects how genes are expressed and therefore influence an organism’s phenotype. 2b. What might be the result of an exceptionally hot spring on wing pigmentation in the western white butterfly? 2b. An exceptionally hot spring will likely result in lighter wing colors in the western white butterfly.

  4. p. 321 A.Q. 1a, 2ab, 3 3. Construct a genetics problem to be given as an assignment to a classmate… Answer key… 3. Your answer here!

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