Mendelian Genetics and Dihybrid Crosses - Notes

What is Mendel's Second Law commonly known as?

• Law of Segregation

• Law of Independent Assortment

• Law of Dominance

• Law of Heredity

In a dihybrid cross, what is the expected phenotypic ratio according to Mendel's findings?

• 3:1

• 9:3:3:1

• 1:2:1

• 1:1

What is the probability of obtaining a round and yellow phenotype in a dihybrid cross?

• 9/16

• 3/16

• 1/16

• 1/4

Which of the following is NOT an assumption of the 9:3:3:1 phenotypic ratio?

• Both loci assort independently

• One allele at each locus is completely dominant

• There are interactions between the two genes

• Each of four possible phenotypes can be distinguished unambiguously

What does the product rule help predict in genetics?

• The probability of a single phenotype

• The probability of two or more independent events occurring

• The probability of a single genotype

• The probability of linked genes

What is the rarest phenotypic class in a dihybrid cross according to Mendel's experiments?

• Round and yellow

• Round and green

• Wrinkled and yellow

• Wrinkled and green

What does a deviation from the 9:3:3:1 phenotypic ratio indicate?

• All conditions of the dihybrid cross are met

• One or more conditions of the dihybrid cross are not met

• The genes are linked

• The genes are not independently assorted