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Polygenic/ Dihybrid Crosses
F. Polygenic Inheritance
Traits in which the phenotypes are determined by many genes contributing to the overall phenotype. Each gene is on a different location on the chromosome and may not even be on the same chromosome. The best way to recognize polygenic inheritance is when the phenotypes exhibit a wide range of expression or variation.
Examples: skin color, hair color, height.
g. Dihybrid Crosses
HE He hE he
HE
He
hE
he
g. Dihybrid Crosses
HE He hE he
HE HHEE
He
hE
he
g. Dihybrid Crosses
HE He hE he
HE HHEE HHEe
He
hE
he
g. Dihybrid Crosses
HE He hE he
HE HHEE HHEe HhEE
He
hE
he
g. Dihybrid Crosses
HE He hE he
HE HHEE HHEe HhEE HhEe
He
hE
he
g. Dihybrid Crosses
HE He hE he
HE HHEE HHEe HhEE HhEe
He HHEe
hE
he
g. Dihybrid Crosses
HE He hE he
HE HHEE HHEe HhEE HhEe
He HHEe HHee
hE
he
g. Dihybrid Crosses
HE He hE he
HE HHEE HHEe HhEE HhEe
He HHEe HHee HhEe
hE
he
g. Dihybrid Crosses
HE He hE he
HE HHEE HHEe HhEE HhEe
He HHEe HHee HhEe Hhee
hE
he
g. Dihybrid Crosses
HE He hE he
HE HHEE HHEe HhEE HhEe
He HHEe HHee HhEe Hhee
hE HhEE
he
g. Dihybrid Crosses
HE He hE he
HE HHEE HHEe HhEE HhEe
He HHEe HHee HhEe Hhee
hE HhEE HhEe
he
g. Dihybrid Crosses
HE He hE he
HE HHEE HHEe HhEE HhEe
He HHEe HHee HhEe Hhee
hE HhEE HhEe hhEE
he
g. Dihybrid Crosses
HE He hE he
HE HHEE HHEe HhEE HhEe
He HHEe HHee HhEe Hhee
hE HhEE HhEe hhEE hhEe
he
g. Dihybrid Crosses
HE He hE he
HE HHEE HHEe HhEE HhEe
He HHEe HHee HhEe Hhee
hE HhEE HhEe hhEE hhEe
he HhEe
g. Dihybrid Crosses
HE He hE he
HE HHEE HHEe HhEE HhEe
He HHEe HHee HhEe Hhee
hE HhEE HhEe hhEE hhEe
he HhEe Hhee
g. Dihybrid Crosses
HE He hE he
HE HHEE HHEe HhEE HhEe
He HHEe HHee HhEe Hhee
hE HhEE HhEe hhEE hhEe
he HhEe Hhee hhEe
g. Dihybrid Crosses
HE He hE he
HE HHEE HHEe HhEE HhEe
He HHEe HHee HhEe Hhee
hE HhEE HhEe hhEE hhEe
he HhEe Hhee hhEe hhee
How many offspring have…..
1. Dark hair and brown eyes? HxEx?
2. Dark hair and blue eyes? Hxee?
3. Red hair and brown eyes? hhEx?
4. Red hair and blue eyes? hhee?
How many offspring have…..
1. Dark hair and brown eyes? HxEx?nine
2. Dark hair and blue eyes? Hxex?
3. Red hair and brown eyes? hxEx?
4. Red hair and blue eyes? Hxex?
How many offspring have…..
1. Dark hair and brown eyes? HxEx?nine
2. Dark hair and blue eyes? Hxex?three
3. Red hair and brown eyes? hxEx?
4. Red hair and blue eyes? Hxex?
How many offspring have…..
1. Dark hair and brown eyes? HxEx?nine
2. Dark hair and blue eyes? Hxex?three
3. Red hair and brown eyes? hxEx?three
4. Red hair and blue eyes? Hxex?
How many offspring have…..
1. Dark hair and brown eyes? HxEx?nine
2. Dark hair and blue eyes? Hxex?three
3. Red hair and brown eyes? hxEx?three
4. Red hair and blue eyes? Hxex?one
