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Dimples (D) and brown hair (A) are dominant traits. Answer the following questions based on the dihybrid cross shown:

1) What genotype(s) would result in a phenotype of dimples and brown hair?

2) What genotype(s) would result in a phenotype of dimples and blonde hair?

3) What genotype(s) would result in a phenotype of no dimples and brown hair?

4) What genotype(s) would result in a phenotype of no dimples and blonde hair?

5) What is the phenotypic ratio for this cross? (Be sure to use words to indicate which number goes with which phenotype!)

Respuesta :

1. DDAA, DdAa
2. DDaa, Dada
3. ddAA, ddAa
4. ddaa
5. The phenotypic ratio is 9:3:3:1 where 9 combinations will produce offspring with both dominant phenotypes (dimples and brown hair), 3 will produce offspring with one dominant phenotype and one receive phenotype (dimples, blonde hair), 3 will produce offspring with one receive phenotype and one dominant phenotype (no dimples, brown hair), and one will produce offspring with both recessive phenotypes (no dimples, blonde hair)