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Principle of dominance states that1/19/2024 ![]() ![]() This law states that one gene of a gene pair will be dominant, while the other will be recessive. The Law of Dominance of Traits is a fundamental principle of genetics that explains how certain traits are expressed in offspring. The allele for Huntington's disease is dominant, meaning that an individual with just one copy of the gene will develop the disease. This means that an individual with one allele for tongue rolling and one allele for not being able to roll their tongue will still be able to roll their tongue because the allele for tongue rolling is dominant.Ī third example is Huntington's disease, a genetic disorder that causes the progressive breakdown of nerve cells in the brain. The ability to roll your tongue is controlled by a dominant allele, while the inability to roll your tongue is controlled by a recessive allele. This means that an individual with one allele for free earlobes and one allele for attached earlobes will have free earlobes because the allele for free earlobes is dominant.Īnother example is tongue-rolling. The allele for free earlobes is dominant, while the allele for attached earlobes is recessive. There are many traits in humans that are controlled by dominant and recessive alleles. The Law of Dominance of Traits applies not just to pea plants, but also to humans. Examples of the Law of Dominance of Traits in Humans For example, when a black-feathered chicken is crossed with a white-feathered chicken, the resulting offspring may have both black and white feathers. In codominance, both alleles are expressed in the phenotype of the offspring. For example, when a red-flowered plant is crossed with a white-flowered plant, the resulting offspring may have pink flowers, which is a blend of the two parental colors.Īnother exception to the Law of Dominance of Traits is codominance. In incomplete dominance, neither allele is completely dominant nor recessive, and the phenotype of the offspring is a blend of the two parental phenotypes. One of these exceptions is incomplete dominance. While the Law of Dominance of Traits is a fundamental principle of genetics, there are some exceptions to this law. The dominant allele is expressed in the phenotype, while the recessive allele remains hidden unless an organism inherits two copies of it.Įxceptions to the Law of Dominance of Traits This example illustrates how the Law of Dominance of Traits works. This was because some of these offspring inherited two copies of the recessive allele for white flowers, while others inherited one dominant allele and one recessive allele for purple flowers. However, when Mendel crossed two of these purple-flowered offspring, he found that some of the resulting offspring had white flowers. This was because the allele for purple flowers was dominant, and the allele for white flowers was recessive. When Mendel crossed a purple-flowered plant with a white-flowered plant, he found that all of the offspring had purple flowers. He hypothesized that there were two alleles for flower color, one for purple and one for white. ![]() Mendel observed that some pea plants had purple flowers, while others had white flowers. This concept can be illustrated using the example of flower color in pea plants. This meant that even if an organism had a recessive allele for a certain trait, it would not be expressed unless it inherited two copies of the recessive allele. The dominant allele was expressed in the phenotype, while the recessive allele remained hidden. ![]() He also discovered that each gene existed in two forms, or alleles, one dominant and one recessive. Through his experiments, Mendel discovered that these traits were controlled by genes, which were passed down from parents to offspring. In his experiments with pea plants, Mendel observed that certain traits, such as flower color or seed shape, were always expressed in the offspring of the pea plants, while others were not. The Law of Dominance of Traits was first proposed by Gregor Mendel, a scientist, and monk who is considered the father of modern genetics. Understanding the Law of Dominance of Traits The content discusses the Law of Dominance of Traits is, how it works, and provides examples to help illustrate this concept. This means that only the dominant gene will be expressed in the phenotype, while the recessive gene will remain hidden. The Law of Dominance of Traits is one of the fundamental principles of genetics. ![]()
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