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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
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.
Chapter 11
Complex Inheritance and Human Heredity
11.2 Complex Patterns of Inheritance
Codominance
 Both alleles are expressed/visible in the
heterozygous condition.
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
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
Chapter 11
Complex Inheritance and Human Heredity
11.2 Complex Patterns of Inheritance
Sex Determination
 Sex chromosomes
determine an
individual’s gender.
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.
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?
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.
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.