When a sperm cell fertilises an egg, an embryo starts to develop. However, it isn't just a case of the same allele being passed on to all the puppies. This allele is picked at random, so each of the two alleles has an equal chance ( 50%) of being passed on. When mammals such as dogs breed, each parent passes on just one allele from each of its loci. These are picked from a list of possible alleles for each locus, which for the B locus is just simply B and b, but for other locii there may be a longer list (the A series, for example, has four known possible alleles - A y, a w, a t and a). ![]() For example, on the B locus they might have the alleles B and b, b and b, or B and B. If you've been reading these pages in order, you will already know that every dog has a set of loci (points on its DNA) with two alleles on each one. However, it's still important to know the basics of inheritance! If you have specific queries about breeding then it's best to become involved with a community of other breeders who can offer guidance. ![]() ![]() The main purpose of this website is simply to teach you about how having different genes affects how a dog looks (phenotype), so I won't go into too much detail about breeding. Use the 'Contact' link for more information
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