When both alleles for a trait are the same?

Both alleles for a trait are the same in an individual. They can be homozygous dominant (YY), or homozygous recessive (yy). heterozygous; usually referring to the offspring of two true-breeding (homozygous) individuals differing in the traits of interest.

What is it called when both alleles are the same?

If the two alleles are the same, the individual is homozygous for that gene. If the alleles are different, the individual is heterozygous. Though the term allele was originally used to describe variation among genes, it now also refers to variation among non-coding DNA sequences.

When the two alleles for a trait are the same?

An organism in which the two copies of the gene are identical — that is, have the same allele — is called homozygous for that gene.

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When 2 alleles are the same the genotype is considered to be?

A particular genotype is described as homozygous if it features two identical alleles and as heterozygous if the two alleles differ.

When both alleles of a heterozygote are expressed that trait is described as?

Codominance describes the simultaneous expression of both of the alleles in the heterozygote. Although diploid organisms can only have two alleles for any given gene, it is common for more than two alleles of a gene to exist in a population.

What is source of the different alleles of the same gene?

What is the original source of variation among the different alleles of a gene? Mutations in a gene lead to the different versions (alleles) of that gene.

Do alleles differ in number of base pairs?

Alleles differ significantly in number of base pairs. … Alleles are specific forms of a gene.

Are both alleles expressed?

In most cases, both alleles are transcribed; this is known as bi-allelic expression (left). However, a minority of genes show monoallelic expression (right). In these cases, only one allele of a gene is expressed (right).

Are alleles on the same chromosome?

An allele is one of two, or more, versions of the same gene at the same place on a chromosome. It can also refer to one of multiple different sequence variations of several-hundred base-pairs long or longer regions of the genome that code for proteins.

What is different between two alleles of the same gene quizlet?

What is different between two alleles of the same gene? The information they carry. For example, one allele might carry the information for blue eye pigment, while the other carries the information for brown eye pigment. Define Mendel’s law of independent assortment.

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How can two individuals have the same phenotype but different genotype for a trait?

It is also tall. The answer is yes, two different genotypes can result in the same phenotype.

Genotype and Phenotype.

Genotype Definition Example
Heterozygous One dominant allele and one recessive allele Tt
Homozygous dominant Two dominant alleles TT
Homozygous recessive Two recessive alleles tt

What is the genotype of a person trait if an organism has two identical alleles for that trait?

If an organism contains two identical alleles for a particular trait, the genotype for this trait is said to be homozygous.

When both alleles are expressed equally in the phenotype of the heterozygotes?

Codominance occurs when both alleles are expressed equally in the phenotype of the heterozygote. The red and white flower in the figure has codominant alleles for red petals and white petals. Codominance.

What type of allele will be expressed if both dominant and recessive alleles are present for a given trait?

If both alleles are dominant, it is called codominance?. 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.

When the effects of both alleles are shown there is said to be?


Codominance is a relationship between two versions of a gene. Individuals receive one version of a gene, called an allele, from each parent. If the alleles are different, the dominant allele usually will be expressed, while the effect of the other allele, called recessive, is masked.

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