Non Mendelian Genetics Patterns of inheritance that arent
- Slides: 14
Non Mendelian Genetics Patterns of inheritance that aren’t simply dominant or recessive EQ: What are the differences between various complex inheritance patterns?
I. Incomplete Dominance A. The phenotype of a heterozygous individual is “blended” between those of the two alleles. B. Examples 1. Snap Dragons – When red and white flowers are crossed – all the F 1 (first generation) offspring will have pink flowers 2. Horses – When a chestnut colored horse is bred with a cremello (white) colored horse; the offspring are palomino color.
P=Parent generation F 1= First generation of offspring F 2= second generation of offspring
II. Co-dominance A. The phenotypes of both alleles are expressed completely and separately; both alleles are expressed equally. B. Examples 1. Short-horned cattle – red and white coats are codominant 2. Chickens – feather color; black and white are codominant 3. Four o’clock plants – red and white petals are codominant
Four o’clock plants Short-horned cattle Black and white feathers
III. Multiple Alleles A. Traits controlled by more than 2 alleles. B. Examples 1. ABO blood type in humans – A and B are codominant, but dominant to O 2. Pigeons – feather color; BA, B and b; BA produces ash red feathers, B produces wild-type (grey) feathers, and b produces chocolate colored feathers
IV. Polygenic Inheritance A. Many traits are controlled by 2 or more genes. B. Examples: 1. Eye color 2. Hair color 3. Skin color 4. Height 5. Fingerprints
Eye Color
Skin Color
V. Traits Influenced by the Environment A. An individuals phenotype often depends on conditions in the environment. B. Such factors as temperature, amount of sunlight, soil conditions and nutrition can affect the phenotype of an organism. C. Examples: 1. Arctic fox – brown in summer; white in winter 2. Hydrangea flower color – acidity of the soil determines blue or reddish color 3. Siamese cats – cooler body areas are darker 4. Height in humans - early nutrition (or lack of) affects the height of humans
- Family resemblance test
- Mendelian inheritance patterns
- Non mendelian inheritance
- Non mendelian genetics multiple alleles
- Codominant allele
- Cystic fibrosis mendelian inheritance
- Probability laws govern mendelian inheritance
- Mendelian theory of inheritance
- Chromosomes and alleles
- In watermelons bitter fruit (b) is dominant
- Section 11-5 linkage and gene maps answer key
- Heterozygous for type a blood
- Chapter 7 extending mendelian genetics study guide answers
- Section 11-3 exploring mendelian genetics
- Chapter 10 section 2 mendelian genetics answer key