This observation leads us to conclude that colour and vision traits in this instance are related. Mendelian inheritance states that the offspring’s phenotypic differences are the result of the mixture of different alleles (Lan and al., 2017). The result is that two different puppies likely had different alleles. As an example, the puppy with a brown hair likely came from one parent while the puppy with blindness was likely to have inherited it from the other (Hu et. al., 2019, 2019). This is confirmed by Mendelian inheritance principles.