Final answer:
Inheritance of color in fish and other organisms is determined by the combination of genes from the parent individuals. This can result in a purple color when a blue fish mates with a red fish. Examples from Mendel's experiments with pea plants demonstrate inheritance patterns in flower color.
Step-by-step explanation:
Inheritance of color in fish is determined by the combination of genes from the parent fish. When a blue fish mates with a red fish, their offspring may inherit a combination of the blue and red genes, resulting in a purple color. This type of inheritance is known as codominance, where both alleles are expressed in the phenotype of the offspring.
In another example, Mendel's experiments with pea plants showed that the flower color was determined by inherited factors, or genes. When Mendel crossed true-breeding plants with violet and white flowers, all the offspring in the first generation (F1) had violet flowers. However, in the second generation (F2), approximately three-quarters of the plants had violet flowers, and one-quarter had white flowers.
Therefore, the inheritance of color in fish and other organisms is determined by the combination of genes from the parent individuals, following patterns of inheritance such as codominance or Mendelian genetics.