# Complex Patterns of Inheritance Incomplete/Codominance So far, we

Complex Patterns of Inheritance Incomplete/Codominance So far, we have learned about simple Mendelian inheritance--traits controlled by dominant and recessive paired alleles However, MOST alleles are not simply dominant or recessive

Incomplete Dominance Incomplete Dominance = The phenotype of the heterozygote is intermediate between those of the two homozygotes Example: Snapdragons RR = Red Example: Snapdragons

RR = Red WW= White Example: Snapdragons RR = Red WW= White RW = Pink Example: Hair

CC = Curly SS = Straight CS= Wavy Punnett square problem: 2 Wavy haired people have a child C C S S

Example: Hair CC = Curly SS = Straight CS= Wavy Punnett square problem: 2 Wavy haired people marry C C S

CC CS S CS SS

25% Curly 50% Wavy 25% Straight Practice Problem: Incomplete Dominance For each practice problem, draw the Punnett square and give the phenotype ratios A: Cross a pink snapdragon with a white

snapdragon B: Cross a red snapdragon with a white snapdragon Codominance Codominance = the heterozygote produces the phenotypes of BOTH homozygotes Example: Blood Type

Example: Chickens BB = Black WW = White BW = Checkered Other examples Cows: RR = Red

WW= White RW=Roan (red and white spots) Horses: GG = Gray WW = White GW=Apaloosa (white with gray spots) Example: Horses Punnett square problem: 2 appaloosa horses

are crossed G G W W Example: Horses

Punnett square problem: 2 appaloosa horses are crossed G G W GG GW

W GW WW 25% Gray 50% Appaloosa 25% White

Codominance Practice Problem For each practice problem, draw the Punnett square and give the phenotype ratios A. Cross a checkered chicken with a black chicken B. Cross two checkered chickens together Output Activity

Read the notes and glue them into your notebook (page 35) Complete the Baby Blunder activity and glue it into your notebook.

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