One parent has a recessive trait.
For example: One parent has blood type AB, the other has blood type OO.
Even though there are more than two alleles, an individual can inherit only two, one from the mother and one from the father.
When two recessive alleles are inherited, the trait associated with those alleles is observed because there is no dominant allele to mask its expression. This results in the individual displaying the recessive trait.
The trait received is recessive.
The trait received is recessive.
If one parent has a dominant trait and and another parent has a recessive trait, then the recessive trait gets hidden while the dominant trait gets shown.
An organism has two alleles for one trait. If the two alleles are the same, the individual is homozygous for that trait, and if they are different, the individual is heterozygous.
An organism that has two different alleles for a single trait is called heterozygous. This means that the organism inherited different versions of the gene responsible for that trait from each parent.
ALD can be inherited as an autosomal recessive trait (requiring two alleles, one from each parent) and as an X-linked trait.
The likelihood of inheriting a genetic trait with more than two alleles is rare. When a trait has multiple alleles, it can result in a wider range of possible expressions of that trait. This can lead to more variation in the phenotype among individuals who inherit different combinations of alleles for that trait.
When more than two alleles are involved in the inheritance of a trait, it is called polygenic inheritance. Many quantitative characters have polygenic inheritance. Inheritance of blood groups is an example of polygenic inheritance in human being.When more than two alleles are involved in the inheritance of a trait, it is called polygenic inheritance. Many quantitative characters have polygenic inheritance. Inheritance of blood groups is an example of polygenic inheritance in human being.
alleles
A diploid organism with two identical alleles for a trait is referred to as homozygous for that trait. This means that both copies of the gene (one inherited from each parent) are the same, resulting in a uniform expression of that trait. For example, if the trait is flower color and both alleles are for red flowers, the organism will consistently produce red flowers.