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.
A chicken with black feathers (BB) is crossed with a chicken with white feathers (WW). The offspring have black and white feathers.What is the genotype of the offspring?1. 2. 3. 4.
This is incomplete dominance✔ codominance because there are two recessive✔ dominantpolygenic traits.
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.
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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