1. Complex Patterns of Inheritance (11.2)
State Standard
2C. Using Mendel’s laws, explain the role of meiosis in reproductive variability.
2D. Describe the relationships between changes in DNA and potential appearance of new traits

2. Chapter 11
Complex Inheritance and Human Heredity
11.2 Complex Patterns of Inheritance
Incomplete Dominance
The heterozygous phenotype is an intermediate phenotype between the two homozygous phenotypes.

3. Both alleles are expressed/visible in the heterozygous condition.
Chapter 11
Complex Inheritance and Human Heredity
11.2 Complex Patterns of Inheritance
Codominance
Both alleles are expressed/visible in the heterozygous condition.

4. Chapter 11
Complex Inheritance and Human Heredity
11.2 Complex Patterns of Inheritance
Sickle-cell Disease
Normal red blood cell
Changes in hemoglobin cause red blood cells to change to a sickle shape.
People who are heterozygous for the trait have both normal and sickle-shaped cells.
Sickle cell
7766x

5. ABO blood groups have three forms of alleles.
Chapter 11
Complex Inheritance and Human Heredity
11.2 Complex Patterns of Inheritance
Multiple Alleles
Blood groups in humans
ABO blood groups have three forms of alleles.
A & B are codominant
O is recessive

6. Sex chromosomes determine an individual’s gender.
Chapter 11
Complex Inheritance and Human Heredity
11.2 Complex Patterns of Inheritance
Sex Determination
Sex chromosomes determine an individual’s gender.

7. Genes located on the sex chromosomes (usually on the x)
Chapter 11
Complex Inheritance and Human Heredity
11.2 Complex Patterns of Inheritance
Sex-Linked Traits
Genes located on the sex chromosomes (usually on the x)
Red-green color blindness - X
Hemophilia – X
A male can’t be a carrier of an X-linked trait.

8. If a man with heterozygous type B blood marries a woman with type AB blood, what is the percent chance of them having a baby with type A blood?

9. In a situation where dark blue flowers are incompletely dominant over white flowers, predict the outcome of a cross between 2 plants with light blue flowers.

10. In a certain breed of chickens, brown feathers & grey feathers are codominant. If a brown-feathered chicken is mated with a grey-feathered chicken, predict the genotypic & phenotypic percentage outcomes.