what are the two different types of alleles?
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Different versions of a gene are called alleles. Alleles are described as either dominant or recessive depending on their associated traits.
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In codominant inheritance, two different versions (alleles) of a gene are expressed, and each version makes a slightly different protein. Both alleles influence the genetic trait or determine the characteristics of the genetic condition.
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The MHC genes are highly polymorphic; many different alleles exist in the different individuals inside a population. The polymorphism is so high, in a mixed population (nonendogamic), no two individuals have exactly the same set of MHC molecules, with the exception of identical twins.
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The allele frequency would be the number of “A” cards (out of the total cards in the room) and the number of “a” cards (out of the total cards in the room). The genotype frequencies would be the number of people with two “A” cards out of the total number of people.
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There are three versions (called “alleles”) of this gene: A, B, and O. A person's blood type is determined by which allele he/she inherits from each parent. You can see that the A and B genes are “co-dominant”. In other words, if both an A and B allele are inherited, both are expressed.
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An organism which has two different alleles of the gene is called heterozygous. Phenotypes (the expressed characteristics) associated with a certain allele can sometimes be dominant or recessive, but often they are neither.
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In a diploid organism, one that has two copies of each chromosome, two alleles make up the individual's genotype. An example is the gene for blossom color in many species of flower — a single gene controls the color of the petals, but there may be several different versions (or alleles) of the gene.
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If a cat inherited the A allele, the T gene determines what kind of tabby pattern will be produced. The dominant allele, T, produces the mackerel or striped tabby coat; the Ta allele produces an all-agouti tabby like the Abyssinian; and the recessive tb allele produces the classic, or blotched, tabby.
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An organism that is homozygous has two copies of the same allele. An allele is one version, like a "flavor", of a gene. ... Homozygous means having two of the same allele. Heterozygous means having two different alleles.
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The alleles that make up the genes of an organism, known collectively as a genotype, exist in pairs that are identical, known as homozygous, or mismatched, known as heterozygous. When one of the alleles of a heterozygous pair masks the presence of another, recessive allele, it is known as a dominant allele.
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polymorphism is a variation in an allele at the sequence level. A common one is Single Mutation Polymorphisms SNPs. Multiple allelism means that in a population there are more than one alleles for a certain gene.
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Major vs Minor Allele The major allele is the common letter/allele/variation/nucleotide. The minor allele is the less common letter/allele/variation/nucleotide. There are usually only two possible variations, but in rare cases there is a third.
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A dominant allele is an allele that will express the dominant phenotype when only one allele is present. In contrast, a recessive allele is an allele that is only expressed when both alleles are in the genotype.
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The two chromosomal copies (alleles) of a gene are designated A and a. 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).
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In humans and other organisms, there are traits that have three or more different types of alleles (genes). Whenever a given trait has three or more different alleles, we say that the trait has multiple alleles. One example of a trait the has multiple alleles is the human ABO blood group trait.
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In most cases, both alleles of a gene are transcribed; this is known as bi-allelic expression. However, a minority of genes show monoallelic expression. In these cases, only one allele of a gene is expressed.
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Different versions of the same gene are called alleles. Genes can have two or more possible alleles. Individual humans have two alleles, or versions, of every gene. Because humans have two gene variants for each gene, we are known as diploid organisms.