This is incomplete dominance✔ codominance because there are two recessive✔ dominantpolygenic traits.
Explain why polygenic traits are expressed through quantitative variation, using skin color as an example.
If there are more alleles present for darker skin tone, then the offspring will have darker skin pigment than the parents may have. There can be varying expressions of pigment color from dark to light based on the alleles received, even in the same family. The sum of the allele combinations determines the expression of the trait from one degree to the other. A bell curve shows the quantitative variation.
Type AType BType AB✔ Type O blood is known as the universal donor, which means it can be given to anyone needing a blood transfusion.Type AType B✔ Type ABType O blood is known as the universal recipient, which means it can receive all blood types during a transfusion.
Polygenic traits are determined by multiple blood typescells✔ genes received from each parent.
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Incomplete dominance✔ CodominancePolygenic inheritance explains inheritance resulting in two dominant alleles being expressed in the offspring, with neither trait being masked.
✔ Incomplete dominanceCodominancePolygenic inheritance explains traits that are neither dominant nor recessive, resulting in a third phenotype in the offspring that appears to blend the traits from the parents.
Mendelian traits✔ Polygenic traitsCodominant traits are traits resulting from the expression of multiple genes from different loci of different chromosomes.
✔ Rhesus factorAntigen factorAntibody factor is a protein found in blood that is represented by a + or – sign, which affects the compatibility of blood with other blood types.
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.
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