Allele Variation
Allele Variation - Related Videos
01:14
What is Variation?
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2023
Apart from the measures of central tendency, distribution, outliers, and the changing characteristics of data with time, an important characteristic of any data set is its variation or spread. In some data sets, the data values are concentrated closely near the mean; in others, the data values are more widely spread out from the mean. The range, standard deviation, standard error, and variance are the different measures of variation. Range: The range is the difference between its maximum and...
02:19
Multiple Allele Traits
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2021
For the same gene multiple alleles can interact to influence phenotypes like the shape and protein composition of an individual cells.By studying allele interactions on the molecular and cellular levels researchers can understand the resulting phenotypes and complications of human conditions like sickle cell trait, improving treatment.The ABO blood group system is a common example of multiple alleles in humans. This system includes three alleles called IA, IB, and i alleles, which combine in...
02:41
Lethal Alleles
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2021
Agouti: A Lethal Allele Lucien Cuénot discovered lethal alleles in 1905 while studying the inheritance of coat color in mice. The agouti gene is responsible for the color of the coat in mice. This gene codes for an agouti-signaling protein, which is responsible for melanin distribution in mammals. The wild-type allele gives rise to gray-brown coat color in mice, while the mutant allele gives rise to yellow coat color. In addition to coat color, the agouti gene is associated with the yellow...
10:17
An Allele-specific Gene Expression Assay to Test the Functional Basis of Genetic Associations
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Cited by 2 •
2010
Genetic associations often remain unexplained at a functional level. This method aims to assess the effect of phenotype-associated genetic markers on gene expression by analyzing cells heterozygous for transcribed SNPs. The technology allows accurate measurement by MALDI-TOF mass spectrometry to quantify allele-specific primer extension products.
01:19
Variation
0 Views •
2023
An important characteristic of any set of data is the variation in the data. In some data sets, the data values are concentrated closely near the mean; in other data sets, the data values are more widely spread out from the mean. The most common measure of variation, or spread, is the standard deviation, which is the square root of variance. When independent and dependent variables are plotted on a scatter plot, the slope of a line is a value that describes the rate of change between the two...
FAQs
Mutations alter DNA sequences, creating changes that can produce different versions of a gene. This process supplies new genetic differences within a population, whereas meiosis and recombination mainly rearrange alleles that already exist. The distinction matters because mutation introduces variation, while subsequent inheritance and population processes determine how that variation is distributed and maintained.
Meiosis and recombination reshuffle alleles into new combinations during reproduction. They do not necessarily create new DNA changes, but they can produce individuals with different combinations of inherited versions of genes. These new combinations contribute to genetic diversity and help explain why offspring may differ from one another even when they inherit alleles from the same population.
These processes influence how common particular alleles become across generations. Natural selection favors patterns associated with particular environmental conditions, genetic drift changes frequencies through population-level chance effects, and gene flow changes populations through the movement of alleles between them. Considering all three helps biologists explain why genetic variation increases, decreases, or differs among populations.
An allele may affect how an individual responds to a particular environmental condition, so its significance can depend on the setting in which it occurs. Natural selection can then influence its frequency over generations. Examining allele variation alongside environmental conditions helps biologists connect genetic differences with adaptation and variation in traits.
Biologists examine the different gene versions present in a population, consider how DNA changes and recombination produced them, and study how their frequencies change across generations. They can then relate those patterns to inheritance, traits, environmental conditions, and population history. This approach connects genetic differences with broader explanations of diversity and evolution.
Comparing allele variation among populations can help biologists examine their genetic similarities and differences. Those patterns provide context for studying evolutionary relationships, while changes in allele frequencies across generations can indicate how populations have responded to selection, drift, or gene flow. The same analysis also contributes to understanding population adaptation and genetic diversity.
Different alleles can contribute to differences in disease susceptibility and in how individuals respond to medical treatments. Studying these genetic differences helps biologists investigate why a treatment response may vary among people and how inherited variation relates to health-related traits. This application connects population-level genetic diversity with differences observed among individuals.