are dimples a recessive trait?
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Dimples—indentations on the cheeks—tend to occur in families, and this trait is assumed to be inherited. Dimples are usually considered a dominant genetic trait, which means that one copy of the altered gene in each cell is sufficient to cause dimples.
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Not too many Americans have dimples While it's true that dimples are way more prevalent than many other birth defects that are considered "common," you're more likely not to have dimples. In fact, around 80 percent of the United States population does not have the facial abnormality.
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But sometimes something goes wrong and an animal ends up with extra or missing digits. And surprisingly, having five fingers in these cases is usually a recessive trait. When people or animals are born with extra fingers this typically dominant trait is called polydactyly.
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Whether or not a trait is common has to do with how many copies of that gene version (or allele) are in the population. It has little or nothing to do with whether the trait is dominant or recessive. Let's take eye color as an example. ... Here the not-brown allele is more common even though it is recessive.
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Inherited traits include things such as hair color, eye color, muscle structure, bone structure, and even features like the shape of a nose. Inheritable traits are traits that get passed down from generation to the next generation. This might include things like passing red hair down in a family.
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Dominant traits are those traits which are expressed even in the presence of one copy of an allele for a particular trait in the gene. ... Recessive traits are those that are expressed only when two copies of an allele are present in the gene.
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Whether an allele is dominant or not does not affect how common a trait is. Now of course traits can become more common over time. The changes just don't have anything to do with whether the trait is dominant or not. ... Why some gene versions are dominant and some are recessive.
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One study found that men preferred women with facial traits similar to their own, including eye color, hair color, and chin dimples. Cheek dimples weren't evaluated in the study, but perhaps people with dimples prefer other people with dimples. Dimples may also help us communicate with others.
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Facial and Body Features And crooked teeth can be inherited too, because the configuration of the jaw and the tilt of the teeth are genetically determined. There's even a specific gene for "gap tooth" that's been discovered and is believed to be dominant.
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Sally's genotype is "dd", so she is also considered homozygous. Susan's genotype is "Dd", so she is considered HETEROZYGOUS (has two different alleles for a specific gene). Although Susan has both the allele "D" to make dimples and the allele "d" in her genotype, her phenotype is the presence of dimples.
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Well, to answer your question, only 20% of the population owns dimples which means that dimples are not common. The world's 20% of the population is only the one who can have dimples. ... Although dimples do look attractive yet medical science has proven that the dimples occur because of a genetic deformity.
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(In genetic terms, a dominant trait is one that is phenotypically expressed in heterozygotes). A dominant trait is opposed to a recessive trait which is expressed only when two copies of the gene are present. (In genetic terms, a recessive trait is one that is phenotypically expressed only in homozygotes).
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1) A man has extra digits (six fingers on each hand and six toes on each foot). His wife and their daughter have a normal number of digits. Having extra digits is a dominant trait. ... Cactuses with the dominant allele, S, have sharp spines, whereas homozygous recessive ss cactuses have dull spines.
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And surprisingly, having five fingers in these cases is usually a recessive trait. When people or animals are born with extra fingers this typically dominant trait is called polydactyly. ... At first it may seem weird that a dominant trait is rare or a recessive trait is common but this actually happens all the time.
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People with dimples of Venus (more commonly known as back dimples) are considered extremely lucky. Normally found just above a person's bottom, these symmetrical indentations offer great significance to those who are naturally blessed.
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CONCLUSIONS: Pigmentary demarcation lines are fairly common in the Indian population especially amongst the females. Hormonal influences could possibly explain the female preponderance. Aggregation of cases within families or among close relatives suggests a genetic background.
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Figure 8-1. For a recessive mutation to give rise to a mutant phenotype in a diploid organism, both alleles must carry the mutation. However, one copy of a dominant mutant allele leads to a mutant phenotype. Recessive mutations result in a loss of function, whereas dominant (more...)