Why Can Multiple Alleles Provide Many Different Phenotypes For A Trait

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Why Can Multiple Alleles Provide Many Different Phenotypes For A Trait?

Why can multiple alleles result in many different phenotypes for a trait? This can happen because the more allele options for a specific gene the more possible combinations and therefore possible phenotypes the organism that has that gene could inherit.

How do multiple alleles provide many different phenotypes for a single trait?

Genes have multiple alleles. These alleles can provide many phenotypes for a trait. For example a gene for eye color has variations of alleles that include an allele for brown eyes blue eyes green eyes etc. Having multiple alleles in a trait can make more random combinations of phenotypes during assortment.

How do multiple alleles affect the number of phenotypes?

Having more than 1 or 2 alleles for a trait can greatly increase the number of phenotypes depending on the trait’s specific pattern of inheritance. … So while you could have two people with different alleles like one is AA and one is Ao they would both have the same phenotype which is blood type A.

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How do multiple allele traits work?

Traits controlled by more than two alleles have multiple alleles. Although any one person usually has only two alleles for a gene more than two alleles can exist in the population’s gene pool. Theoretically any base change will result in a new allele.

Why is it important to have multiple alleles for a trait?

Although humans (and all diploid organisms) can have only two alleles for any given gene in genetics multiple allele traits may exist at the population level. Thus multiple alleles are important in promoting variation within the same species. … These alternatives are two alleles of the same gene.

How is it possible that there are multiple different alleles in a population and yet any individual can have only two alleles?

How is it possible that there are multiple different alleles in a population and yet any individual can have only two alleles? In the population as a whole there are many copies of each chromosome so any gene can have multiple alleles present in the different copies.

Why can multiple alleles only be studied in populations?

Why can multiple alleles only be studied in populations? Any individual diploid organism can have at most two different alleles at a single locus.

How is the phenotype of a trait with multiple alleles different from a Mendelian trait?

Multiple alleles is a type of non-Mendelian inheritance pattern that involves more than just the typical two alleles that usually code for a certain characteristic in a species. … This allowed many more phenotypes to be visible for any given trait while still following Mendel’s Laws of Inheritance.

When or more alleles determine a trait the trait is said to have multiple alleles?

Traits controlled by more than two alleles have multiple alleles. Many genes have multiple phenotypic effects a property called pleiotropy. Epistasis is when a gene at one location (locus) alters the phenotypic expression of a gene at another locus.

Why is multiple allele trait described as such?

Traits controlled by a single gene with more than two alleles are called multiple allele traits. An example is ABO blood type. Your blood type refers to which of certain proteins called antigens are found on your red blood cells.

Multiple Allele Traits.
Genotype Phenotype (blood type)
ii O
IAIB AB

What does it mean for a trait to have multiple alleles quizlet?

Terms in this set (5)

Multiple Alleles. – When three or more alleles control a trait. Example. Blood Types in humans.

What is multiple alleles explain with the help of 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 a trait controlled by multiple alleles?

A trait that is controlled by more than one gene is called polygenic which translates to “multiple genes”. The genes work together to make one trait. Examples are skin eye and hair color. … In that case one gene has more than two alleles. An example of multiple alleles is blood type.

What is the difference between multiple alleles and multiple genes?

In case of multiple alleles the same DNA strand is involved whereas polygenic inheritance is found on multiple DNA strands. Multiple alleles involve multiple alternate forms of a gene while polygenic traits are regulated by a group of non-allelic genes. … Hence in blood type there is one gene but three alleles.

How many different phenotypes are possible?

There are three common alleles in the ABO system. These alleles segregate and assort into six genotypes as shown in Table 1. As Table 1 indicates only four phenotypes result from the six possible ABO genotypes.

Why does an individual always have only two alleles for a given gene?

Since diploid organisms have two copies of each chromosome they have two of each gene. Since genes come in more than one version an organism can have two of the same alleles of a gene or two different alleles. This is important because alleles can be dominant recessive or codominant to each other.

What are multiple alleles can a person have more than two alleles for a single gene explain your answer?

multiple alleles Three or more alternative forms of a gene (alleles) that can occupy the same locus. However only two of the alleles can be present in a single organism. For example the ABO system of blood groups is controlled by three alleles only two of which are present in an individual.

Is multiple alleles also occurs in the fur color of rabbits and laboratory mice?

One of the best-known examples of multiple allele inheritance is coat color in rabbits. A single gene that has at least four different alleles determines a rabbit’s coat color. The four known alleles display a pattern of simple dominance that can produce four coat colors.

When multiple alleles exist in a population for a single locus how many of these alleles does a diploid individual have?

two alleles

Although individual humans (and all diploid organisms) can only have two alleles for a given gene multiple alleles may exist at the population level such that many combinations of two alleles are observed.

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How can a gene have multiple alleles?

Multiple alleles exist in a population when there are many variations of a gene present. In organisms with two copies of every gene also known as diploid organisms each organism has the ability to express two alleles at the same time. They can be the same allele which is called a homozygous genotype.

How many phenotypes and genotypes are possible for ABO blood groups?

The genetic locus ABO locus encodes for the ABO blood group antigens. It has 3 allelic forms – A form B form and O form. A fetus receives one of these three alleles from each of its parents. This produces four possible phenotypes (blood types) and six possible genotypes.

Is it possible for more than two alleles of a gene to exist?

Although individual humans (and all diploid organisms) can only have two alleles for a given gene multiple alleles may exist in a population level and different individuals in the population may have different pairs of these alleles.

What are the differences between genotypes and phenotypes?

The genotype is a set of genes in the DNA which are responsible for the unique trait or characteristics. Whereas the phenotype is the physical appearance or characteristic of the organism. Thus we can find the human genetic code with the help of their genotype.

Can two organisms have different phenotypes but the same genotype?

Due to the presence of a dominant allele the same phenotype but distinct genotype is possible. … The other allele is known as recessive when a dominant allele is entirely dominant over another allele. Recessive alleles only demonstrate their effect if the individual has two copies of the alleles.

Which trait is normally controlled by multiple alleles but not multiple genes?

Which Trait Is Normally Controlled By Multiple Alleles But Not Multiple Genes? The ABO blood group in humans is a trait controlled by a single ABO gene with three types of alleles (multiple alleles) are seen.

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

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.

When three or more possible alleles determine the trait?

Three or more alleles of the same gene that code for a single trait called multiple allele traits.

When the phenotypic expression of a character is controlled by two or more than two genes or alleles it is due to?

What is polygenic inheritance? Polygenic inheritance in simple terms implies a character or phenotypic trait which is regulated by more than one gene. In biology it refers to the quantitative inheritance wherein two or more independent genes additively affect a single phenotypic trait.

When more than one phenotype is influenced by the same gene?

A polygenic trait is one whose phenotype is influenced by more than one gene. Traits that display a continuous distribution such as height or skin color are polygenic.

How do multiple alleles and polygenic traits differ quizlet?

How do multiple alleles and polygenic traits differ? Multiple allele is a gene with more than 2 alternatives. Polygenic traits is when more than one gene controls 1 trait.

Why do genetically identical twins have different phenotypes?

This uniqueness is a result of the interaction between our genetic make-up inherited from our parents and environmental influences from the moment we are conceived. … As a result identical twins share identical DNA but may show differences in their phenotype due to environmental factors.

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What is the difference between a multiple allele trait and a polygenic trait quizlet?

Multiple alleles are more than 2 different forms of the same gene. Polygenic traits are traits produced by the interaction of severel genes.

How do multiple alleles affect phenotype?

Having more than 1 or 2 alleles for a trait can greatly increase the number of phenotypes depending on the trait’s specific pattern of inheritance. For example human blood type is controlled by 3 alleles (just referring to the ABO blood groups here): A B and O.

Why are multiple alleles important?

Although humans (and all diploid organisms) can have only two alleles for any given gene in genetics multiple allele traits may exist at the population level. Thus multiple alleles are important in promoting variation within the same species. … These alternatives are two alleles of the same gene.

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