Table of Contents
What are dominant alleles?
A dominant allele is a variation of a gene that will produce a certain phenotype, even in the presence of other alleles. When a dominant allele is completely dominant over another allele, the other allele is known as recessive.
What is recessive allele example?
Recessive alleles only show their effect if the individual has two copies of the allele (also known as being homozygous?). For example, the allele for blue eyes is recessive, therefore to have blue eyes you need to have two copies of the ‘blue eye’ allele.
What is dominant gene and recessive gene explain with example?
Dominant and recessive genes. The most common interaction between alleles is a dominant/recessive relationship. An allele of a gene is said to be dominant when it effectively overrules the other (recessive) allele. Eye colour and blood groups are both examples of dominant/recessive gene relationships.
What is a dominant and a recessive trait explain with an example?
The resulting characteristic is due to both alleles being expressed equally. An example of this is the blood group AB which is the result of codominance of the A and B dominant alleles. For example, the allele for blue eyes is recessive, therefore to have blue eyes you need to have two copies of the ‘blue eye’ allele.
Can a person have both a dominant and recessive allele?
An individual with one dominant and one recessive allele for a gene will have the dominant phenotype. They are generally considered “carriers” of the recessive allele: the recessive allele is there, but the recessive phenotype is not.
Is the blue eyed gene a dominant or recessive gene?
Therefore, it has been termed a dominant genetic trait or a dominant allele of that particular gene in the genome. The blue-eyed trait, or allele, is still present, but its effect on the offspring is not seen, so it is termed the recessive allele.
When to use dominant and recessive inheritance in genetics?
Dominant and recessive inheritance are useful concepts when it comes to predicting the probability of an individual inheriting certain phenotypes, especially genetic disorders. But the terms can be confusing when it comes to understanding how a gene specifies a trait.
How does a person get the dominant trait?
In order for a person to show the dominant trait, one of the person’s parents must have the dominant trait (which is an uppercase letter). Remember that human cells carry 2 copies of each chromosome, one from the biological mother’s genes and one from the biological father’s genes.