The ABO blood groups in humans are controlled by multiple alleles.
A single-gene trait is a phenotypic trait controlled by two homologous alleles.
One example of a trait controlled by a single gene with two alleles is flower color in snapdragons. The gene responsible for flower color has two alleles: one for red flowers and one for white flowers.
A polyallelic trait is a trait controlled by multiple alleles (variants of a gene) at a single gene locus. This means there are more than two possible alleles that can influence the trait's expression, resulting in a range of phenotypic variations. This can lead to a complex inheritance pattern.
A trait controlled by many genes
A single gene trait is a specific characteristic or phenotype that is influenced by the expression of a single gene. This means that the presence or absence of a particular trait is determined by variations in one specific gene. Examples include earlobe attachment, hair color, and tongue rolling.
A trait controlled by a gene with multiple alleles is one where more than two variations of a gene exist within a population, influencing the phenotype. A classic example is the ABO blood group system in humans, where the gene has three alleles: A, B, and O. These alleles can combine in different ways, resulting in four possible blood types: A, B, AB, and O. This genetic complexity allows for a greater diversity of traits within a species.
Alleles
Non-Mendelian traits are:A trait with no clearly dominant alleleA trait with four allelesA trait controlled by many genes
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alleles
The blood type trait that is controlled by more than two alleles for a given gene is known as the ABO blood group system. It involves three alleles: A, B, and O, which determine blood types A, B, AB, and O. This system results in four possible blood types due to the combination of these multiple alleles.
A homozygous individual carries two identical alleles for a specific gene. This often leads to a consistent expression of the trait controlled by that gene. Homozygosity can have different impacts depending on whether the alleles are dominant or recessive.