PCAT Biological Processes – Inheritance Pattern in Flowers
- Apr 19, 2018
- PCAT Question of the Day
Crossing red with white flowers can result in an intermediate phenotype of pink flowers. This pattern of inheritance is most consistent with:
A. incomplete dominance.
Click or Explanation
A is correct. Incomplete dominance is a form of inheritance in which neither allele is completely expressed over the other. This results in an intermediate phenotype for heterozygotes. Choice B, codominance, refers to a pattern in which both alleles are fully expressed (for example, the A and B alleles in the ABO blood typing system). Expressivity (Choice C) refers to the degree to which a given phenotype is expressed, and epigenetics (Choice D) refers to modifications to gene expression.
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