A person with blood type AB exhibits codominance.
While Mendel’s principles of dominance and recessiveness apply to many traits, others involve more complex interactions. 1. Incomplete Dominance Neither allele is completely dominant. A blend of the two homozygous traits.
Students often confuse incomplete dominance with codominance. If you are looking for the answer to a problem involving a spotted or speckled organism (like a roan cow or a speckled chicken), you are dealing with . 11.3 other patterns of inheritance answer key
This should help you verify your work, study for exams, and build confidence in predicting genetic crosses beyond peas. Use it not just for memorization, but as a tool to understand the beautiful complexity of heredity.
| Term | Definition | |------|-------------| | Incomplete dominance | Neither allele is completely dominant, resulting in a heterozygous phenotype that is a blend of the two homozygous phenotypes. | | Codominance | Both alleles are fully expressed in the heterozygote, without blending. | | Multiple alleles | A gene that has more than two possible alleles in the population (though any individual inherits only two). | | Polygenic trait | A trait controlled by two or more genes, leading to continuous variation. | | Epistasis | One gene interferes with or masks the expression of another gene. | A person with blood type AB exhibits codominance
While an individual organism only ever has two alleles for a specific gene (one from each parent), a may have many different versions of that gene. Human Example: ABO Blood Groups. There aren't just "A" or "B" alleles. There are IAcap I to the cap A-th power IBcap I to the cap B-th power
A black-feathered bird crossed with a white-feathered bird produces offspring with . Incomplete Dominance Neither allele is completely dominant
| | ( I^A ) | i | |-------|-----------|---------| | ( I^B ) | ( I^A I^B ) (AB) | ( I^B i ) (B) | | i | ( I^A i ) (A) | ii (O) |
: Cases where one allele is not completely dominant over another. The heterozygous phenotype is a
Red-green color blindness is X-linked recessive (Xb). A carrier female (XBXb) marries a normal vision male (XBY). What is the chance their son will be colorblind?