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P represents the dominant allele, and p the recessive allele. Sex-linked traits In these traits, the gene is located on the X chromosome. The gene expression is influenced by a variety of factors including gender, nutrition, breed, rate of growth, and amount of exercise.
These animal have normal sight but are carriers. The phenotype is what you actually see in the animal, and this can be influenced by both environmental and developmental factors. Because the recessive gene is carried in the population in outwardly normal animals, it is very difficult to eradicate these traits.
When an egg is fertilized by the sperm, the resulting cell from which the animal will develop has complete pairs again.