The appearance of freckles is considered the __________.

• A. genotype
• B. genome
• C. phenotype
• D. karyotype

Answer: (C)

Verified step by step guidance

1. Understand the concept of phenotype: In genetics, phenotype refers to the observable characteristics or traits of an organism, such as its morphology, development, biochemical properties, and behavior. These traits result from the interaction of the organism's genotype with the environment.
2. Differentiate between genotype and phenotype: Genotype is the genetic makeup of an organism, the information contained within its DNA. Phenotype is the expression of that genetic information as observable traits. Freckles are a visible trait, thus part of the phenotype.
3. Consider the role of the environment: While genotype provides the genetic potential for traits, the environment can influence how these traits are expressed. For example, sun exposure can affect the visibility of freckles.
4. Identify the correct term: Given the options, freckles are an observable trait, which aligns with the definition of phenotype. Genotype and genome refer to genetic information, while karyotype refers to the number and appearance of chromosomes.
5. Conclude with the definition: The appearance of freckles is considered the phenotype because it is an observable characteristic resulting from the interaction of genetic and environmental factors.