Dihybrid Crosses and Non-Mendelian Genetics

1. An organism of genotype AaBb can make gametes of all the following kinds except:

• AB

• Bb

• aB

• ab

What goes in box 3?

• Aabb

• AABB

• AAbb

• 
  aaBb

In a cross between two Homozygous plants,
(RRYY x rryy)
R = round seeds, r  = wrinkled seeds Y = yellow seeds, y = green seeds
What percent will have Round and Yellow seeds? 

• 0%

• 25%

• 50%

• 100%

Which term(s) best describes the inheritance of human blood types?

• incomplete dominance and multiple alleles

• codominance and epistasis

• codominance and multiple alleles

• incomplete dominance and codominance

A man with type AB blood marries a woman with type B blood whose father has type O blood. What are the chances that they have a child with type A blood?

• 0%

• 25%

• 50%

• 75%

• 100%

Using the dihybrid cross and key provided, what is the probability of the offspring being tall and white?

• 9/16

• 2/16

• 3/16

• 6/16

Based off this Punnett square, what fraction of the offspring will have wrinkled, green seeds?

• 9/16

• 3/16

• 1/16

• 16/16

If Green (G) peas are dominant to yellow peas (g) and Round peas (R) are dominant to wrinkled seeds (r), which of the following shows the genotype for a pea plant that is homozygous recessive for yellow, and heterozygous for round?

• GgRr

• GGRr

• GGrr

• ggRr

A white mouse with red eyes is crossed with a black mouse with brown eyes. The white mouse is recessive for both of its traits. The black mouse is dominant for both of its traits.

This cross would be

• 
  BBEE x bbee

• BBEe x BbEe

• BbEE x BbEe

• BBee x BBEE

3. If the offspring of a cross show a 9/16 to 3/16 to 3/16 to 1/16 ratio (9:3:3:1), the parents of the cross have the genotypes

• AaBb x AaBb

• AaBb x aaBB

• aaBb x aabb

• aaBb x Aabb