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Genetic Patterns in Tribbles #1 a) Red b) black c) pheno 3:1 red to black geno 1:2:1 RR Rr rr P1 RR x rr F1 Rr Rr x Rr F2 RR Rr Rr rr Tribbles #2 A. Codominance both blue & yellow hairs B. HB and HY C. HB HY x HB HB green blue HB HY HB HB HB HB HY HB HB HB HB HY D. ratios Pheno: 50% blue hair 50% green (both) 1:1 Geno: 50% HB HB 50% HB HY 1:1 #3 • a) Red, Blue and Yellow H R HB HY • b) black and white hb hw • c) black is recessive to red, blue, & yellow, but black is dominant to white #4 • A) spotted and blue hair • D) To get a 9:3:3:1 ratio that is a normal dihybrid heterozygous cross: • B) solid and black hair • TtHBhb x TtHBhb B Thb tHB thb • TH • C) T (spots) t (solid) B • TH B b H h • Thb • tHB • thb #5 • A) spotted and red hair • B) solid and white hair • C) white spots will not show on a white background (they blend in, but the spotted genes will still be there!) #6 • A) gene D seems to control how much pigment is made • B) There is a blending of color amounts, therefore this is incomplete dominance • C) no pigment is made therefore they are white • D) hwhw dd hwhw TT or tt • white hair no pigment white hair & spots/solid #7 • A) HB HR DD x HY HR dd • B) HY HR Dd • purple with incomplete pigment production #8 • A) must be sex-linked if only males have the trait (or a majority of males have trait) • B) HB HB XnY x HB HB XNXn #9 Genes in Tribbles chart TRAIT Dominant Allele Recessive Allele Coat Color Blue HB Black hb Red HR HY White hw Yellow Coat Pattern Normal XN Plaid Xn Pigment Production Normal D No pigment d Spots Spots T Solid t Additional Practice • http://biology.clc.uc.edu/courses/bio105/gen eprob.htm • This is on my website under links also!! – Go there for practice.