Download Non Mendelian Genetics Cornell Notes

Non-Mendelian Genetics
Patterns of inheritance that aren’t simply dominant or recessive
I. Incomplete Dominance
A. The _____________ of a heterozygous individual is _____________ between those of the
two homozygotes.
B. Examples
1. ____ _______ – When red and white flowers are crossed – all the F1 offspring will
have ____ flowers
2. ______ – When a chestnut colored horse is bred with a white colored horse; the
offspring are _________ color.
II. Co-dominance
A. The _________ of both homozygotes are produced in the heterozygous individuals; ____
alleles are expressed _______.
B. Examples
1. _____-_____ _____ – red and white coats are co-dominant
2. _________ – feather color; black and white are co-dominant
3. ____ ______ ______ – red and white petals are co-dominant
III. Multiple Alleles
A. Traits controlled by ____ ___ _ alleles.
B. Examples
1. ___ _____ ____ in humans – A and B are codominant, but dominant to O
2. _______ – feather color; BA, B and b; BA produces ash red feathers, B produces
wild-type (grey) feathers, and b produces chocolate colored feathers
Blood types
IV. Polygenic Inheritance
A. Many traits are ________ by _ __ ____ genes.
B. Examples:
1. ___ _____
2. ____ _____
3. ___ _____
4. ______
skin color
Eye color
V. Traits Influenced by the Environment
height
A. An individuals ________ often depends on __________ in the __________.
B. Such factors as __________, amount of ________, ____ conditions and _________ can
affect the phenotype of an organism.
C. Examples:
1. ______ ___ – brown in summer; white in winter
2. _________ flower color – acidity of the soil determines blue or reddish color
3. ________ cats – cooler body areas are darker
4. ______ in humans - early nutrition (or lack of) affects the height of humans
Hydrangeas
Arctic fox
Siamese cat