A genotype is a portion of the DNA sequence in an organism that is generally associated with a specific trait. For instance if you have a gene that codes for a protein, it may have two different genotypes that produce different results. The phenotype on the other hand is what you actually see. An organism can have a genotype that is associated with having red hair, but their phenotype is having red hair. The reason why it is an association is that the genotype isn’t the only thing that determines the phenotype. There is an additional layer of information that decides the phenotype called the epigenetics which roughly speaking specifies where and when the genetic information is read. There are also environmental influences that can change the phenotype. So the phenotype is the observable result of the genotype, the epigenetics, and environmental influences.

A genotype is the combination of alleles in an individual organism. The phenotype is the effect that those alleles have when expressed, whether the effect is a physical change, a chemical change, a behavior, or all three.

So, for example, my eyes are blue; this is my phenotype. I have two copies of the human blue-eye allele. My cousin has one copy of the blue-eye allele and one copy of the brown-eye allele; that's her genotype. Her eyes are brown; that's her phenotype.

Genotype is the actual genetic makeup, which for most animals means the set of genes, where half are from the mother and half are from the father. You can determine genotype from genetic testing (for example taking blood and testing the DNA).

The phenotype is the actual trait that you can see directly in an animal, without having to do genetic testing. This includes things like eye color, body size, the shape of features like noses and ears, etc. The phenotype is usually mostly determined by the genotype, but environmental factors may contribute to the phenotype. For example, an animal may have a large-body genotype, but if the animal is undernourished, this may prevent them from growing as large as their genotype allowed for. The resulting body size of the animal is its phenotype.

Genotype refers to the unique DNA sequence of an individual. Phenotype is the outward characteristics that result from that genotype.