2
2
Each person has two alleles for their blood type, one dominant and one recessive. Except for type AB blood where the alleles are co-dominant. The allele for O blood is always recessive when paired with either an A or B allele.
These traits are called dominant traits. They will overcome the recessive gene and the dominant trait will be expressed. A recessive gene needs two alleles present in its genotype to be expressed.
Blood type in humans is controlled by three alleles at the ABO gene locus on chromosome 9. These three alleles are responsible for determining the blood types A, B, AB, and O. Each person inherits one allele from each parent, resulting in various blood type combinations.
Alleles affect traits like eye color. Alleles for brown and blue eyes are dominant and recessive respectively. Individuals who have homozygous and heterozygous genotypes with the dominant allele will have brown eyes. However individuals are homozygous for the recessive allele will have blue eyes.
A man with two recessive alleles for earwax would have the phenotype of dry earwax. Since dry earwax is the recessive trait, having two recessive alleles means he expresses this trait. Therefore, his phenotype is characterized by dry earwax.
2
The ABO blood groups in humans are controlled by multiple alleles.
Blood types are controlled by multiple alleles.
Not necessarily. I think the dominant genes are more common, but there are lot of exceptions out there. For example, having six fingers in humans is a dominant gene, but it isn't all that common.
Human blood type is determined by codominant alleles.
Genes that come together with different alleles are called _____.
Multiple alleles
Each person has two alleles for their blood type, one dominant and one recessive. Except for type AB blood where the alleles are co-dominant. The allele for O blood is always recessive when paired with either an A or B allele.
I think it is Dominant and recessive.
These traits are called dominant traits. They will overcome the recessive gene and the dominant trait will be expressed. A recessive gene needs two alleles present in its genotype to be expressed.
When one trait is controlled by four alleles, it is referred to as multiple allelism. In this genetic scenario, more than two alleles exist for a single gene within a population, leading to a variety of possible phenotypes depending on the combination of alleles present in an individual. An example of this is the ABO blood group system in humans, where four alleles (IA, IB, i) determine blood type.