Mendelian traits✔ Polygenic traitsCodominant traits are traits resulting from the expression of multiple genes from different loci of different chromosomes.
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Explain incomplete dominance, using snapdragon flowers as an example.
Incomplete dominance occurs when neither allele is fully dominant over the other. In snapdragons, a red-flowered plant crossed with a white-flowered plant produces pink-flowered offspring, showing an intermediate color.
This is because there are two traits.
on the blood determine a person’s blood type. in the blood attack foreign blood not compatible with the antigens on the blood.
blood is known as the universal donor, which means it can be given to anyone needing a blood transfusion. blood is known as the universal recipient, which means it can receive all blood types during a transfusion.
The Rh factor identifies the presence of the rhesus protein in blood. The Rh factor can be represented by a + or – sign. It is important to know the Rh factor because just like how the antigens on the blood must be compatible, the rhesus protein in blood must also be compatible. If a person has Rh+ blood they can receive blood.If a person has Rh- blood they can receive blood.
Polygenic traits are determined by multiple received from each parent.
Explain why polygenic traits are expressed through quantitative variation, using skin color as an example.
Polygenic traits show quantitative variation because multiple genes contribute to the trait, with each allele adding a small amount to the overall phenotype. For example, different combinations of skin-color alleles produce a continuous range of pigmentation from light to dark.
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