what trait is controlled by one gene?
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Traits controlled by a single gene with more than two alleles are called multiple allele traits. An example is ABO blood type. There are three common alleles for this trait, which can be represented by the letters A, B, and O. As shown in Table below, there are six possible ABO genotypes but only four phenotypes.
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A quantitative trait is a characteristic controlled by multiple genes as well as the environment. Some good examples of quantitative traits include IQ, blood pressure, height, and weight.
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Two Dominant Genes. ... These matching gene pairs are called alleles. A dominant allele masks the expression of the recessive gene's trait. The alleles are homozygous if they code for the same trait and heterozygous if they code for different traits. A homozygous pair might have two dominant or two recessive alleles.
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Autosomal traits are controlled by genes on one of the 22 pairs of human autosomes. ... These traits are called X-linked traits. Single-gene X-linked traits have a different pattern of inheritance than single-gene autosomal traits because males have just one X chromosome.
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Like chromosomes, genes also come in pairs. Each of your parents has two copies of each of their genes, and each parent passes along just one copy to make up the genes you have. Genes that are passed on to you determine many of your traits, such as your hair color and skin color.
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When one gene influences multiple phenotypic traits. ... A trait that is determined by several genes. Sickle-cell Anemia. An example of pleiotropy, a person who inherits the mutated HBs gene will contract sickle-cell anemia, which damages erythrocytes, the spleen, and many other organs of the body.
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Dominance is not inherent to an allele or its traits (phenotype). It is a strictly relative effect between two alleles of a given gene of any function; one allele can be dominant over a second allele of the same gene, recessive to a third and co-dominant with a fourth.
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What Is a Gene? Genes carry the information that determines your traits (say: trates), which are features or characteristics that are passed on to you — or inherited — from your parents. Each cell in the human body contains about 25,000 to 35,000 genes.
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When we talk about genes being dominant or recessive, we're generally talking about traits controlled by the amount of a certain protein produced. ... If genes are controlling a process where all of the alleles need to be on the same page in terms of protein production, the dominant gene will be the one that's broken.
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The inheritance of each trait is determined by 'factors' (now known as genes) that are passed onto descendants. Individuals inherit one 'factor' from each parent for each trait. A trait may not show up in an individual but can still be passed onto the next generation.
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Dominant traits are traits that will be expressed even if there is one of them. Recessive traits must have both parents give the same recessive trait for it to be expressed. heterozygous alleles are when a pair of alleles have a different version of a certain trait.
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People who inherit one sickle cell gene and one normal gene have sickle cell trait (SCT). People with SCT usually do not have any of the symptoms of sickle cell disease (SCD), but they can pass the trait on to their children.
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['Genes and Their Alleles. Some phenotypic characteristics are controlled by just one gene. ... ', 'Simple Inheritance. Simple inheritance describes phenotypic characteristics that appear as either one of two forms. ... ', 'Sex-Linked Recessive Traits. Sex chromosomes define the physiological gender of humans. ... ', 'Polygenic Traits.']
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dominant allele. an allele whose trait always shows up in the organism when the allele is present.
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How are Traits Passed from Parents to Offspring? A trait is a characteristic, such as color or size, that is inherited by an offspring from its parents. The genes that control a trait come in pairs, one gene from each parent. ... This combination, of the two genes that determine the trait, is called a genotype.
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One allele can be dominant to a second allele, recessive to a third allele, and codominant to a fourth. If a genetic trait is recessive, a person needs to inherit two copies of the gene for the trait to be expressed. Thus, both parents have to be carriers of a recessive trait in order for a child to express that trait.
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Some scientists have reported that handedness is due to a single gene with right handedness dominant and left handedness recessive.