Question

what is the observable characteristic of an organism called? (1 point) genotype karyotype phenotype allele

Explanation:

To solve this, we analyze each option:

• Genotype refers to the genetic makeup, not observable traits.
• Karyotype is a picture of chromosomes, not about observable characteristics of an organism.
• Phenotype is defined as the observable physical or biochemical characteristics of an organism, which matches the question.
• Allele is a variant form of a gene, not the observable characteristic of the organism.

Answer:

C. Phenotype