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firexstguide - ANS 3384 FIRST EXAM STUDY SHEET Upgrading...

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ANS 3384 FIRST EXAM STUDY SHEET Upgrading Programs: Be able to show how you would incorporate dominant genes such as Sk (the Slick hair gene), E d or P from foundation dams into a breed that has not previously possessed it through the process of upgrading. Also be able to indicate how you would develop animals that were homozygous for these genes, being able to prove their homozygosity. Color genetics: Cattle : be able to work problems utilizing the E-(black/red) Br- (brindle) and the dilute loci (Dc- Charolais-type) color loci, and the S-(S P , S H , S + and s) and R spotting loci, using the fork-line method to predict the probabilities of certain genotypes and phenotypes. Example : What proportion of the calves resulting from the mating of a dilute black cow that carries a restricted Pinzgauer pattern (a Charolais Angus cow) that has previously produced a non-dilute, nonspotted red calf (note: assume that the cow does not carry s) and is mated to a red Holstein bull (ss) will be black and express the full Pinzgauer pattern. Horses : Be able to work problems utilizing the A (black), C (palomino) and E (sorrel) color loci and the T and O (Tobiano and Overo paints), G (gray) and R (lethal roan) spotting loci, using the fork- line method to predict the probabilities of certain genotypes and phenotypes. For practice, work the examples in the horse chapter.
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