explains inheritance resulting in two dominant alleles being expressed in the offspring, with neither trait being masked.
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.
are traits resulting from the expression of multiple genes from different loci of different chromosomes.
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.
⇒ Antigens on the blood determine a person’s blood type. ⇒ Antibodies in the blood attack foreign blood not compatible with the antigens on the blood.
Polygenic traits are determined by multiple blood typescells✔ genes received from each parent.
This is because there are two traits.
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.
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.
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