Question

1a. What is the degree of freedom for a dihybrid in a chi-square analysis?

1b. Ratio of phenotypes from a monohybrid

1c. Ratio of phenotypes from a dihybrid

Answer 1

a) The Degrees of freedom equals to the number of Phenotypic characters minus 1 Eg: In a dihybrid cross. One might posses on attached earlobes and a long fingers: unattached earlobes and short fingers: attached earlobes and short fingers: or on unattached earlobes and short fingers. Hence, the degree of freedom is 3 1b) Ratio of phenotypes from a monohybrid cross is 3: 1 Phenotypes: 3Round Seed: 1 Wrinkled \r\n 1c) Ratio of phenotypes from a dihybrid cross is 9: 3: 3: 1 Round yellow: Round Green: Wrinkled yellow: Wrinkled yellow 9: 3: 3: 1