When both alleles of a heterozygote are expressed in the phenotype the trait is described as?
Codominance means that neither allele can mask the expression of the other allele. An example in humans would be the ABO blood group, where alleles A and alleles B are both expressed. So if an individual inherits allele A from their mother and allele B from their father, they have blood type AB.
What is an expressed allele in a heterozygote?
In a heterozygous genotype, the two different alleles interact with each other. This determines how their traits are expressed. … The allele that’s expressed more strongly is called “dominant,” while the other is called “recessive.” This recessive allele is masked by the dominant one.
What is alleles phenotypic effect is fully expressed in a heterozygote?
Dominant Allele. An allele that is fully expressed in the phenotype of a heterozygote. Only need 1 copy of dominant allele to show dominant trait. Recessive Allele. An allele whose phenotypic effect is not observed in a heterozygote – it is “masked” or hidden.
Is AA heterozygous or homozygous?
Two dominant alleles (AA) or two recessive alleles (aa) are homozygous. One dominant allele and one recessive allele (Aa) is heterozygous.
What is multiple alleles give an example?
Multiple alleles refer to the occurrence of three or more than three alleles for a particular gene. Alleles are different or contrasting forms of a gene. For example, for the gene encoding for height, one allele can be for tallness, whereas the other can be for dwarfness.
What is phenotype example?
Examples of phenotypes include height, wing length, and hair color. Phenotypes also include observable characteristics that can be measured in the laboratory, such as levels of hormones or blood cells.
What do multiple alleles mean?
: an allele of a genetic locus having more than two allelic forms within a population.
Are both alleles of a gene expressed?
In most cases, both alleles of a gene are transcribed; this is known as bi-allelic expression. … In these cases, only one allele of a gene is expressed. Which of the two alleles is expressed may be determined by the parental origin of the allele (such as in imprinting), or the choice may be random.