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. For example, human blood type is controlled by 3 alleles (just referring to the ABO blood groups here): A, B, and O.
What advantage does having multiple alleles give to possible phenotypes available to organisms?
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.
How can a trait have multiple alleles?
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) |
|---|---|
| IBi | B |
| ii | O |
| IAIB | AB |
•May 13, 2020
What is the advantage of multiple alleles?
Multiple Alleles Blood Type Genetic variation is defined as the number and frequency of all different alleles in a species. The more genetic variation a species has, the better suited it is for survival. Genes with more than two alleles allow for a variety of genotypes and phenotypes in a population.
How is it possible to have three phenotypes for the same trait?
Usually, more versions of a gene means more possible phenotypes. However, three alleles can produce exactly three phenotypes when those alleles are in a dominance series.
What are multiple alleles?
Alleles or allelomorphs are the alternative forms of a gene present at the same locus on the homologous chromosomes. Some genes have more than two allelic forms, which is referred to as multiple alleles.
How can multiple alleles lead to variation?
Multiple alleles combine in different ways in a population, and produce different phenotypes. These phenotypes are caused by the proteins encoded for by the various alleles. Although each gene encodes for the same type of protein, the different alleles can cause high variability in the functioning of these proteins.
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.
Why might genetically identical twins have different phenotypes?
Identical or monozygotic twins occur when a single egg is fertilised to form 1 zygote that divides into 2 separate embryos. As a result, identical twins share identical DNA but may show differences in their phenotype due to environmental factors.
How many phenotypes are possible with 3 genes?
three phenotypes However, three alleles can produce exactly three phenotypes when those alleles are in a dominance series.
How is the number of phenotypes related to the number of genes that control the trait?
Explanation. The number of phenotypes for a certain trait is usually influenced by the number of genes that control the trait. It can either be a single-gene trait or a polygenic trait. A single-gene trait refers to a characteristic or a phenotype that is controlled by one gene.
When more than one phenotype is influenced by the same gene then dominance?
Dominance is not an autonomous feature of a gene in case more than one phenotype is influence by the same gene. Dominance is not an autonomous feature of a gene in case more than one phenotype is influence by the same gene.
How does multiple alleles affect inheritance?
With multiple alleles, that means there are more than two phenotypes available depending on the dominant or recessive alleles that are available in the trait and the dominance pattern the individual alleles follow when combined together.
What do multiple alleles mean?
Definition of multiple allele : an allele of a genetic locus having more than two allelic forms within a population.
Why might genetically identical twins have different phenotypes quizlet?
They may have different phenotypes because of differences in their environments, such as nutrition and healthcare. Why might genetically identical twins have different phenotypes? List three patterns of inheritance that are different than the dominant-recessive pattern of Mendel's peas.
Why do humans have different phenotypes?
Phenotypic variation in humans is a direct consequence of genetic variation, which acts in conjunction with environmental and behavioral factors to produce phenotypic diversity. Genetic variants are classified by two basic criteria: their genetic composition and their frequency in the population.
How can you tell how many different phenotypes are possible?
0:193:34How many phenotypes are possible as result of the cross – YouTubeYouTube
How many phenotypes does each trait have?
Figure 13: The possible genotypes for each of the four phenotypes. Even though only four different phenotypes are possible from this cross, nine different genotypes are possible, as shown in Figure 13.
What determines the number of phenotypes for a given trait?
The number of phenotypes for a certain trait is usually influenced by the number of genes that control the trait. It can either be a single-gene trait or a polygenic trait. A single-gene trait refers to a characteristic or a phenotype that is controlled by one gene.
What does the number of phenotypes produced for a given trait depend on?
The number of phenotypes produced for a given trait depends on how many genes control the trait. 1. Single-gene trait: Single gene that has two alleles. Example: Free earlobes (FF, Ff) or attached earlobes (ff).
When more than one phenotypes are influenced by the same gene than dominance is not an autonomous feature of the gene it depends on 😕
<br> Reason : Dominance depends much on the gene product and the production of a particular phenotype from this product. The gene which affect more than one phenotype called pleiotropic gene.
How can one genotype give rise to multiple phenotypes?
Genotype generally remains constant from one environment to another, although occasional spontaneous mutations may occur which cause it to change. However, when the same genotype is subjected to different environments, it can produce a wide range of phenotypes.
What is the difference between a multiple allele trait and a polygenic trait quizlet?
What is the difference between multiple alleles and polygenic traits? Multiple alleles are more than two different forms of the same gene. Polygenic traits are traits produced by the interaction of several genes (each of which may not have multiple alleles.)
What determines phenotype?
Phenotype refers to an individual's observable traits, such as height, eye color and blood type. A person's phenotype is determined by both their genomic makeup (genotype) and environmental factors.
How many phenotypes can be expressed?
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.
How many phenotypes are possible with 3 alleles?
Usually, more versions of a gene means more possible phenotypes. However, three alleles can produce exactly three phenotypes when those alleles are in a dominance series.
How are phenotypes determined?
Phenotype refers to an individual's observable traits, such as height, eye color and blood type. A person's phenotype is determined by both their genomic makeup (genotype) and environmental factors.
What are the factors which causes variation in phenotypes?
Differences in genotype (or genotypic variations) produce phenotypic variation. Genotypic variations are caused by mutations, gene flow, and sexual reproduction. Environmental conditions such as climate, availability of food, and interactions with other organisms can contribute to phenotypic variation.
Does the number of phenotypes produced for a given trait depend on how many genes control the trait?
The number of phenotypes produced for a given trait depends on how many genes control the trait.
When more than one phenotype is influenced by the same gene than Dominance?
<br> Reason: Dominance depends much on the gene product and the production of a particular phenotype from this product. The gene which affect more than one phenotype called pleiotropic gene.