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An allele causes a trait by either being dominant orrecessive or example, allele A will occur over allele a because it is dominant.
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In order to have a recessive trait an organism must have what copies of he recessive allele?
In order to express a recessive trait, an organism must have two copies of the recessive allele, one inherited from each parent. This is because the presence of a dominant allele will mask the effect of the recessive allele, preventing the recessive trait from being expressed. Thus, only when both alleles are recessive will the trait be visible in the organism's phenotype.
What is a trait that appears only if an organism has two factors for the traits?
A trait that appears only if an organism has two factors for that trait is known as a recessive trait. Recessive traits are expressed phenotypically only when an individual has two copies of the recessive allele, one inherited from each parent. If an organism has one dominant allele and one recessive allele, the dominant trait will be expressed instead. This concept is a fundamental aspect of Mendelian genetics.
What is An allele or trait that exerts a controlling influence?
An allele or trait that exerts a controlling influence is known as a dominant allele. This type of allele can mask the expression of a recessive allele when both are present in an organism's genotype. As a result, the trait associated with the dominant allele will be expressed in the phenotype, while the recessive trait may not be observed. Dominance is a key concept in genetics, influencing inheritance patterns in organisms.
What does it mean that an organism is homozygous recessive for a trait?
An organism that is homozygous recessive for a trait carries two copies of the recessive allele for that trait. This means that the individual will express the recessive trait because there is no dominant allele to mask its expression.
What does it mean that an organism is homozygous dominant for a trait?
Homozygous Dominant for a trait means that an organism has two dominant alleles for that trait. Here's an example: Trait: Widow's Peak Widow's Peak allele: Dominant (D) No widow's peak allele: Reccessive(d) Homozygous Dominant (DD) Homozygous Reccessive (dd) Heterozygous (Dd)
Is an allele a trait that determines a specific characteristic in an organism?
Yes, an allele is a variant form of a gene that determines a specific characteristic or trait in an organism.
Which is the dominant allele?
The dominant allele is the trait that shows up in the organism when the allele is present
When is the only time a recessive trait appears on a organism?
A recessive trait only appears in an organism when it is homozygous for that trait, meaning it has two copies of the recessive allele. This occurs when an organism inherits the recessive allele from both parents.
Organisms that has two different alleles for a trait?
An organism with two different alleles for a trait is said to be heterozygous for that trait. This means that it has one dominant allele and one recessive allele. The dominant allele will usually determine the organism's phenotype for that trait.
In order to have a recessive trait an organism must have what copies of he recessive allele?
In order to express a recessive trait, an organism must have two copies of the recessive allele, one inherited from each parent. This is because the presence of a dominant allele will mask the effect of the recessive allele, preventing the recessive trait from being expressed. Thus, only when both alleles are recessive will the trait be visible in the organism's phenotype.
How can an organism have two different alleles for one trait but show one observable trait?
One allele would be dominant and the second allele would be recessive, so the organism would show only the dominant trait.
If a trait made an organism less likely to survive and reproduce what would happen to the allele for the trait?
The allele would not be passed on to further generations, as the organism cannot reproduce. There would be a smaller population of that organism who's genetic code does not contain the allele for that particular trait.
What is a trait that appears only if an organism has two factors for the traits?
A trait that appears only if an organism has two factors for that trait is known as a recessive trait. Recessive traits are expressed phenotypically only when an individual has two copies of the recessive allele, one inherited from each parent. If an organism has one dominant allele and one recessive allele, the dominant trait will be expressed instead. This concept is a fundamental aspect of Mendelian genetics.
An organism carrying one dominant and one recessive allele for particular trait would be for that trait?
Heterozygous.
When an organism is carrying one dominant and one recessive allele for a particular trait what would be that trait?
Heterozygous
Is it true that an organism with a dominant allele for a particular form of a trait only exhibits the trait sometimes?
true
How does a dominant trait affect the phenotype of an organism?
If the the trait is controlled by only one allele and the allele is completely dominant then once inherited the offspring with exhibit that phenotype
