Practice with Dihybrid Crosses

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1. A long neck yellow giraffe (T t Y y), mates <strong>with</strong> a short neck orange giraffe (t t y y). ___________ X ___________ Possible phenotypes Long/Yellow____ : Long Orange ____ : Short/Yellow ____ : Short/Orange____ 2. A fast red fox (F f R R), mates <strong>with</strong> a slow grey fox (f f r r). ___________ X ___________
Possible phenotypes Fast/Red____ : Fast/Grey ____ : Slow/Red ____ : Slow/Grey ____ 3. A pea plant is heterozygous for both seed shape and seed color. S is the allele for the dominant, spherical shape characteristic; s is the allele for the recessive, dented shape characteristic. Y is the allele for the dominant, yellow color characteristic; y is the allele for the recessive, green color characteristic. What will be the distribution of these two alleles in this plant's gametes 4. What genetic cross would give a phenotypic ratio of 9:3:3:1 5. List the gametes of a plant of genotype SSYy. 6. Which genotypes would you expect to find among the offspring of a SsYy x ssyy test cross 7. What is the expected phenotypic ratio of the progeny of a SsYy x ssyy test cross
Page 1: Name: _____________________________
Page 5 and 6: 10. In a dihybrid cross, SsYy x SsY
Page 7 and 8: 13. In the breeding season, male An
Page 9: 15. Suppose in a strain of soybeans

Practice with Dihybrid Crosses

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