Well, in terms of genetics, each chromosome is carrying two alleles, and because the two dogs are different breeds, their alleles for different characteristics such as fur colour, nose shape, eye shape etc, will be different, and when these alleles combine, they will form a new genotype, and most likely a new phenotype as well, meaning their visible characteristics, depending on which alleles combine, and whether they act in a simple dominance/recessiveness, co-dominant, incomplete dominant, or epistatic manner; would influence their characteristics, which could be the same as one parent only (somewhat) or they may be completely different, and a new phenotype would result.
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