Genetics Codominance Incomplete Dominance Warm up What happens
- Slides: 15
Genetics Codominance & Incomplete Dominance
Warm up • What happens if you mix yellow paint with blue paint? • How could this be used as an analogy to describe the inheritance of certain traits?
Exceptions in Inheritance of Traits • Not all traits are inherited as dominant or recessive from a single gene (pair of alleles). – Incomplete dominance – Codominance – One gene, many traits – Many genes, one trait – Environmental impact
One Gene, Many Traits • Sometimes, one gene influences more than one trait. – Ex: white tiger • Gene for white fur also causes blue eyes
Many Genes, One Trait • Some traits are the result of several genes acting together. – Ex: color of your skin, hair, and eyes • Difficult to tell if the traits are a result of a dominant or recessive allele. At least two genes determine human eye color. That’s why many shades of a single color are possible.
The Importance of Environment • A dog with the genes for long fur could have its fur cut short. • You may have the genotype to grow tall, but you need a healthy diet to reach your full height.
Foldable Codominance Incomplete Dominance
Codominance Red x White = Red & White • Co = together – coexist (exist together) – cooperate (work together) • In codominance, both traits appear (both traits are equally dominant)
Punnett Square Example CR CW CW CR CR CW C = color CRCR = red CWCW = white CRCW = red & white 1. Parents with two different phenotypes produce offspring with a third phenotype. 2. Both parents’ traits show up together in the offspring.
Another Example of Codominance
Other Codominance Examples • Cattle – Red x White = Roan • Human Blood Types – A x B = AB
Incomplete Dominance • Incomplete dominance – produces a mixing or blend of the two traits • Red x White = Pink
Punnett Square Example R R W RW RW RR = red WW = white RW = pink 1. Parents with two different phenotypes produce offspring with a third phenotype. 2. Both parents’ traits show up together in the offspring.
Another Example of Incomplete Dominance • Horses – Chestnut brown x creamy white = palomino
Practice: Codominance & Incomplete Dominance • Incomplete and Codominant practice worksheet. doc
- Describe incomplete dominance
- Palomino horse incomplete dominance
- Codominance
- Incomplete dominance definition
- Harry potter genetics incomplete dominance answer key
- The difference between dominance and codominance
- Inconplete dominance
- Codomince
- Incomplete vs codominance
- Dog
- Punnett square red hair
- Genetics yellow and blue make answer key
- Incomplete dominance in snapdragons
- Co dominance with example
- Incomplete dominance
- When neither allele is dominant