incomplete dominance & codominance section 11-3 in book
TRANSCRIPT
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Incomplete Dominance & Codominance
Section 11-3 in Book
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Review of Mendel’s Principles
Genes are passed parents offspring; get one allele from each parent
During Meiosis, the alleles for a gene segregate from each other.
During Meiosis, genes independently assort with each other.
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Exceptions to Mendel’s principles
Sometimes, there is no dominant or recessive gene, or the trait is controlled by many alleles or genes.
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Neither allele is dominant Heterozygous phenotype produces 3rd phenotype
somewhere between homozygous phenotype.
Incomplete Dominance
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1. Incomplete Dominance
Examples: Trait: Flower Color
Expressions: Red x White Pink
RR= Red; RW= pink; WW= white
straight hair, wavy, curly
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Incomplete Dominance
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In codominance, both alleles are dominant and are expressed in heterozygous organisms.
Codominance
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2. Codominance Both alleles contribute to the phenotype.
Example: In come chickens
Black Chicken x White Speckled Chicken
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YOU tell me which type of dominance…
Codominance!
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Type of Dominance?
Incomplete Dominance!
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Type of Dominance?
Incomplete Dominance!
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Multiple Alleles
Gene has more than two alleles. Ex. Blood type in humans
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Polygenic Traits
Trait controlled by two or more genes Ex. Skin color of humans (4 different
genes) Reddish-brown eyes of fruit flies
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Sex-Linked Genes/Traits
Special pattern of inheritance for genes located on the X and Y chromosomes.
Y chromosome is very small only holds a few genes
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3 human genes associated with color vision are on the X chromosome.
In males, a defected version of these genes produces colorblindness.
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Why the difference? Males only have one X chromosome.
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Pedigree