Presentation on theme: "Animal Science Breeding & Genetics"— Presentation transcript:
1Animal Science Breeding & Genetics Original Power Point Created by Casey OsksaModified by Georgia Agricultural Education Curriculum OfficeJune 2002
2Genetics Terms Heterozygous = two different types of genes (Bb) Homozygous = two similar genes (BB)Dominant Gene = trait overpowers othersRecessive Gene = must be accompanied with another recessive gene to express traitIncomplete Dominance = both traits express themselves
3Punnet Square Shorthorn Cattle R = Red W = white RW = roan If a red bull (RR) is mated to a white cow (WW), what color will the calves be?
11Punnet SquareMate an Angus bull that is homozygous black and polled (BBPP) to a red shorthorn cow which is homozygous red and horned (bbpp).What is the probability that the offspring will be black? Polled? Horned? Black and Polled?
13Punnet SquareNow mate two of the offspring which are heterozygous for black/red and polled/horned (BbPp)What is the probability that the offspring will be black? Black Polled? Black Horned? Red? Red Polled? Red Horned?
14Punnet Square How do you do a punnet square with multiple genes? Use all possible gene combinationsBbPp = could be BP, Bp, bP,bp4 x 4 grid
16Punnet Square Black = 12 out of 16 or 75% Black Polled = 9 out of 16 or 56.25%Black Horned = 3 out of 16 or 18.75%Red = 4 out of 16 or 25%Red Polled = 3 out of 16 or 18.75%Red Horned = 1 out of 16 or 6.25%
17Punnet SquareMate a heterozygous bull (BbPp) to a homozygous cow (BBPP)What are the outcomes?