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Hi @some_someone, You might want to have a look at http://bowlingsite.mcf.com/genetics/BasGen4.html.
the various types are listed below, if any is unclear tell me what you find mysterious. Single-locus inheritance Dominant-recessive Intermediate Co-dominant Sex-limited Sex-linked More complex inheritance will be covered on the next page, and includes Modifier genes Polygenic additive Threshold traits Variable expression Incomplete penetrance Polygenic recessive or dominant Mixed polygenic
1.We will consider a number of types of inheritance. The first group actually refer to single-gene traits. Any of these types of inheritance may also be involved in the inheritance of multiple-gene traits. Single-locus inheritance Dominant-recessive Intermediate Co-dominant Sex-limited Sex-linked More complex inheritance will be covered on the next page, and includes Modifier genes Polygenic additive Threshold traits Variable expression Incomplete penetrance Polygenic recessive or dominant Mixed polygenic
2. The first listed allele is expressed, the second one is hidden or carried. If one parent is brown (b/b) [also called chocolate] the "b" allele is the ONLY one that can be copied and inherited by the puppy. So, the puppy will receive a copy of the "b" allele from one parent. If the other parent is B/B the only allele that the puppy can receive is "B". So, every puppy will be B/b -- black, carrying brown. If one parent is B/b, the puppy can receive either "B" or "b". If the other parent is also B/b, the puppy can receive either "B" or "b". The puppies could be: B/B - black; B/b - black, and carrying brown; or b/b - brown/chocolate.
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