Dominant Lethal
Dominant Lethal - Related Videos
01:29
Dominant and Dominated Strategies
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2025
In strategic decision-making, a dominant strategy is one that always provides the best outcome for a player, no matter what the other players decide. This ensures that the player's payoff is maximized regardless of the choices made by others. On the other hand, a dominated strategy consistently leads to a worse outcome than another available strategy, regardless of the opponent's decision. For instance, imagine two firms competing in a market by setting production levels—either high or low.
01:43
Incomplete Dominance
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2021
Gregor Mendel's work (1822 - 1884) was primarily focused on pea plants. Through his initial experiments, he determined that every gene in a diploid cell has two variants called alleles inherited from each parent. He suggested that amongst these two alleles, one allele is dominant in character and the other recessive. The combination of alleles determines the phenotype of a gene in an organism. According to Mendel, organisms with both copies or a single copy of the dominant allele display a...
03:34
Assessing Social Dominance in Mouse Models Using the Tube Test
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Cited by 1 •
2025
This protocol describes a behavioral assay to evaluate social dominance in rodents using the tube test. Social dominance remains stable over time, and several models of developmental and neurological disorders exhibit robust social dominance abnormalities. Therefore, the tube test serves as a convenient outcome measure for mechanistic studies or preclinical therapeutic screening.
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...
01:30
Equilibrium in Dominant Strategies
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2025
In game theory, equilibrium in dominant strategies arises when each player selects their optimal strategy independently of others' choices. This simplifies analysis since each player's best decision is predictable without considering opponents' actions. Understanding Dominant Strategy Equilibrium A dominant strategy consistently offers the best outcome for a player, regardless of the choices of other players. When all players adopt their dominant strategies, the game reaches a stable...
FAQs
Its effect reflects disruption of an essential cellular function rather than simply the appearance of a visible trait. Because the allele can cause death while present in one copy, the affected cellular process is sufficiently important that its disturbance has consequences for survival. This makes dominant lethals useful for linking particular genes with essential biological functions.
The outcome depends on when the affected gene is required. If its function is essential before birth, death may occur during embryonic development; if the requirement arises later, an individual may survive longer but die before reproducing. This timing explains why dominant lethals can produce different developmental outcomes while sharing the same inheritance pattern.
Individuals carrying the allele may die before reproducing, so they often cannot pass it to descendants. Natural transmission is therefore limited, helping explain the allele's low frequency in populations. New mutations can introduce dominant lethal alleles again, creating a continuing source even when reproductive selection removes many existing copies.
A dominant trait can be transmitted when an affected individual survives and reproduces, whereas a dominant lethal may prevent transmission by causing death before reproduction. The contrast is important because dominance describes the allele's effect in a single copy, while reproductive timing determines whether that allele can persist in a population.
The allele's severe effect provides evidence that the affected gene participates in an essential cellular process. By relating the lethal outcome to the stage at which death occurs, biologists can connect gene activity with survival and development. This makes dominant lethals valuable for investigating gene function and the genetic basis of developmental failure.
When death occurs before birth or during development, the allele indicates that the disrupted gene is needed at a particular stage of embryonic survival. Studying that relationship helps biologists understand how gene requirements change during development. The findings can also contribute to broader knowledge about how genetic disruption produces developmental disease.
Their unusual inheritance pattern matters when evaluating how a lethal allele may appear in families or populations. Because affected carriers may not reproduce, researchers must consider both reproductive loss and the possibility of new mutations. These features make dominant lethals relevant to genetic counseling and to analyses of allele occurrence and persistence.