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Why a person with an allele for a particular trait may not have a phenotype that shows the trait?
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In a heterozygous genotype the alleles always shows in the phenotype.?
In a heterozygous genotype, where an individual possesses two different alleles for a particular gene, the phenotype can be influenced by the dominance relationship between the alleles. Typically, the dominant allele will mask the expression of the recessive allele, resulting in the phenotype reflecting only the dominant trait. However, in some cases, such as incomplete dominance or codominance, both alleles can contribute to the phenotype. Therefore, it is not accurate to say that both alleles always show in the phenotype.
When one allele shows dominance over another allele?
In cases of complete dominance, one allele, known as the dominant allele, masks the expression of the other allele, known as the recessive allele, in the heterozygous state. This results in only the dominant allele being expressed in the phenotype.
What is the genotype of a pea plant that shows the recessive phenotype?
The genotype of a pea plant that shows a recessive phenotype would be homozygous for the recessive allele. Using letter symbols, it would be represented as aa.
Does a dominant allele mask a ressessive allele?
In diploid organisms (those with two copies of each gene carried on separate chromosomes), one of the copies of a given gene may differ from the other copy of the same gene on the twin chromosome. In some cases one version of the gene (the dominant allele) has the effect of 'masking' the activity of the other (the recessive allele); that is, the presence of the dominant allele negates the effect of the recessive allele on the organism's phenotype. There are many mechanisms which can cause this phenomena, and it depends on the particular genes involved, but a simple model is one where the recessive allele is a biochemically inactive version of the dominant allele. In this case the dominant allele would mask the effect of the recessive allele by providing an active version of the gene. The dominant phenotype would be the one which shows the downstream effects of this activity, and the recessive phenotype one which shows the downstream effects of a lack of activity. The dominant allele is said to 'mask' the recessive allele because only one copy is required to result in an elimination of the recessive phenotype, whereas all copies of the gene must be the recessive allele to result in the recessive phenotype.
What are the phenotypes of two dominant alleles?
If two alleles are dominant, the phenotypes will reflect the dominant traits associated with each allele. Both alleles will be expressed in the phenotype, resulting in a phenotype that shows the dominant characteristics of both alleles.
Why is it that a person with an allele for a particular trait may not have a phenotype that shows the trait?
a dominant allele will express its trait , as well as be carried by the person. the word carrier is commonly used for a person who bears an allele which does not express itself(i.e. a recessive gene).
What is an allele that always shows up in an organism's phenotype called - an allele that masks the other allele?
An allele that always shows up in an organism's phenotype and masks the expression of another allele is called dominant. Dominant alleles are always expressed, even when paired with a recessive allele.
What is an individual with genotype AAA described as?
An Aa genotype can result in the same phenotype as either an AA or AA genotype, if one of the alleles acts in a dominant fashion. If the A allele is dominant over the a allele, then the phenotype of a heterozygous (Aa) individual will be the same as the phenotype of a homozygous dominant (AA) individual.
In a heterozygous genotype the alleles always shows in the phenotype.?
In a heterozygous genotype, where an individual possesses two different alleles for a particular gene, the phenotype can be influenced by the dominance relationship between the alleles. Typically, the dominant allele will mask the expression of the recessive allele, resulting in the phenotype reflecting only the dominant trait. However, in some cases, such as incomplete dominance or codominance, both alleles can contribute to the phenotype. Therefore, it is not accurate to say that both alleles always show in the phenotype.
When one allele shows dominance over another allele?
In cases of complete dominance, one allele, known as the dominant allele, masks the expression of the other allele, known as the recessive allele, in the heterozygous state. This results in only the dominant allele being expressed in the phenotype.
Why a person with an allele for a particular trait may not have a phenotype that shows that trait?
An individual with a recessive allele for a trait may not exhibit the phenotype if they also have a dominant allele masking the expression of the recessive allele. This is known as the principle of dominance in genetics. The recessive allele will only be expressed phenotypically if an individual inherits two copies of that recessive allele.
What is the genotype of a pea plant that shows the recessive phenotype?
The genotype of a pea plant that shows a recessive phenotype would be homozygous for the recessive allele. Using letter symbols, it would be represented as aa.
Does a dominant allele mask a ressessive allele?
In diploid organisms (those with two copies of each gene carried on separate chromosomes), one of the copies of a given gene may differ from the other copy of the same gene on the twin chromosome. In some cases one version of the gene (the dominant allele) has the effect of 'masking' the activity of the other (the recessive allele); that is, the presence of the dominant allele negates the effect of the recessive allele on the organism's phenotype. There are many mechanisms which can cause this phenomena, and it depends on the particular genes involved, but a simple model is one where the recessive allele is a biochemically inactive version of the dominant allele. In this case the dominant allele would mask the effect of the recessive allele by providing an active version of the gene. The dominant phenotype would be the one which shows the downstream effects of this activity, and the recessive phenotype one which shows the downstream effects of a lack of activity. The dominant allele is said to 'mask' the recessive allele because only one copy is required to result in an elimination of the recessive phenotype, whereas all copies of the gene must be the recessive allele to result in the recessive phenotype.
What results when one allele is not dominant over the other?
When one allele is not dominant over the other, both alleles contribute to the phenotype in a form of incomplete dominance or codominance. In incomplete dominance, the heterozygous individual displays a phenotype that is a blend of the two alleles. In codominance, both alleles are expressed independently, resulting in a phenotype that shows traits from both alleles.
How do dominant and recessive alleles affect pheno type?
An allele can effect the phenotype of an organism by its dominance or recessiveness. If two dominant alleles are crossed the offsprings will carry the dominant trait of the alleles. If a dominant allele is crossed with recessive allele the phenotype of the offsprings will be of that of the dominant allele. And if two recessive alleles are crossed the phenotype of their offsprings will carry the reccesive trait.
What are the phenotypes of two dominant alleles?
If two alleles are dominant, the phenotypes will reflect the dominant traits associated with each allele. Both alleles will be expressed in the phenotype, resulting in a phenotype that shows the dominant characteristics of both alleles.
Which is the dominant allele?
The dominant allele is the trait that shows up in the organism when the allele is present
