EQ: How can we make predictions about the

inheritance of TWO traits?

Chapter 11-3: Dihybrid CrossesBut first, a little review…

Subject A Subject B Subject CGenotype for Fur

ColorGG Gg gg

Phenotype for Fur Color

Gray Fur Gray Fur White Fur

Subject A Subject B Subject CGenotype for Fur

ColorGG Gg gg

Phenotype for Fur Color

Gray Fur Gray Fur White Fur

GGBb (male) × GgBb (female)

G G

G

g

B b

B

b

G G G G

G g G g

B B B b

B b b b

G g

g

g

G

G

g

g

g g

g g

B b

B

B

B

B

B

B

B b

B b

GgBb (male) × ggBB (female)

GGBb (male) × GgBb (female)

G G

G

g

B b

B

b

G GSolid Gray Fur

G GSolid Gray Fur

G gSolid Gray Fur

G gSolid Gray Fur

B BGreen eyes B bGreen

eyes

B bGreen eyes b bBlue

eyes

Only 75% of the offspring will have green eyes.

GGBb (male) × GgBb (female)

G G

G

g

B b

B

b

G G G G

G g G g

B B B b

B b b b

GgBb (male) × GgBb (female)

G g

G

g

B b

B

b

G GSolid Gray Fur

G gSolid Gray Fur

G gSolid Gray Fur

g gStriped Gray Fur

B BGreen eyes B bGreen

eyes

B bGreen eyes b bBlue

eyes

GgBb (male) × GgBb (female)

G g

g

g

B b

B

b

G g g g

G g g g

B B B b

B b b b

GgBb (male) × GgBb (female)

B b

b

b

B b b b

B b b b

G g

g

g

G g g g

G g g g