Genetics Michelle Bohanan March 27, 2008. © Gil Repetto.

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Presentation transcript:

Genetics Michelle Bohanan March 27, 2008

© Gil Repetto

© M. Bohanan

 Uppercase symbols indicate the gene is dominant  Dominant genes express a trait whether they are homozygous or heterozygous  Dominant genes sometimes show incomplete dominance  Lowercase symbols indicate the gene is recessive  Recessive genes express a trait only when they are homozygous

© Gil Repetto

Standard (+/+) © M. Bohanan

Standard (+/+) Single-Dose Veil (V/+) © M. Bohanan

Standard (+/+) Single-Dose Veil (V/+) Double-Dose Veil (V/V) © M. Bohanan

Mutations –Dark Locus Dark (D) Marble (M) Gold Marble (Gm) New Gold (g) (may be unexpectedly dominant )

© Gil Repetto Black Lace Smokey Locus (Sm)

© Gil Repetto Mutations Chocolate Smokey Locus (Sm) Pearlscale Locus (p) Halfblack Locus (h) Albino Locus (a)

© M. Bohanan Mutations Blushing (S/S) Zebra (Z) Stripeless (S) Platinum Blue (~pb~)

© Rich & Judy Halas Combinations ?What are the possible genetic combinations that would produce this phenotype? Clown (Z/S)Ex. Zebra (Z) Stripeless (S) Z + S = Z/S = Clown

© Rich & Judy Halas Combinations ?What are the possible genetic combinations that would produce this phenotype? Clown (Z/S)Ex. Zebra (Z) Stripeless (S) Z + S = Z/S = Clown Albino pearlscale a/a- p/p Albino Locus (a) a/a X Pearlscale Locus (p) p/p Black Clown (D/D - Z/S)