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.

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.

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

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

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.

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.

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.