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Trihybrid Crosses02:27

Trihybrid Crosses

Trihybrid Crosses
Some of Mendel’s crosses examined three pairs of contrasting characteristics. Such a cross is called a trihybrid cross. A trihybrid cross is a combination of three individual monohybrid crosses. For example, plant height (tall vs. short), seed shape (round vs. wrinkled), and seed color (yellow vs. green).
The F1 generation plants of a trihybrid cross are heterozygous for all three traits and produce eight gametes. Upon self-fertilization, these gametes have an equal chance to...
Incomplete Dominance01:43

Incomplete Dominance

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.
Genetic Screens02:46

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Genetic screens are tools used to identify genes and mutations responsible for phenotypes of interest. Genetic screens help identify individuals or a group of people at risk of developing  genetic diseases and help them with early intervention, targeted therapy, and reproductive options.
Forward genetic screens
Forward or “classical” genetic screens involve creating random mutations in an organism’s DNA using radiation, mutagens, or insertion of additional bases, which result in visible changes...
Epistasis Analysis01:09

Epistasis Analysis

Although Mendel chose seven unrelated traits in peas to study gene segregation, most traits involve multiple gene interactions that create a spectrum of phenotypes. When the interaction of various genes or alleles at different locations influences a phenotype, this is called epistasis. Epistasis often involves one gene masking or interfering with the expression of another (antagonistic epistasis). Epistasis often occurs when different genes are part of the same biochemical pathway. The...
Genetic Variation01:25

Genetic Variation

Genetic variation is the diversity in DNA sequences found among individuals of the same species. This diversity is crucial for a species' survival because it helps organisms adapt to environmental changes. Genetic variation begins with fertilization, where an egg and sperm cell merge. Each of these cells carries 23 chromosomes, up to 46 in the fertilized egg. Chromosomes are long DNA strands that contain genes, the basic units of heredity.
Genes exist in different versions called alleles, which...

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In Vivo Forward Genetic Screen to Identify Novel Neuroprotective Genes in Drosophila melanogaster
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Ingeniería inversa del mapa genotipo-fenotipo con variación genética natural.

Matthew V Rockman1

  • 1Center for Genomics and Systems Biology, Department of Biology, New York University, 100 Washington Square East, New York, New York 10003, USA. mrockman@nyu.edu

Nature
|December 17, 2008
PubMed
Resumen

La variación genética natural ayuda a mapear las relaciones genotipo-fenotipo. Al analizar cómo los cambios genéticos afectan los rasgos, los investigadores pueden inferir causa y efecto y construir redes causales.

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Área de la Ciencia:

  • Genética La genética.
  • Biología de Sistemas Biología de Sistemas.
  • La bioinformática es la bioinformática.

Sus antecedentes:

  • La variación genética natural dentro de las poblaciones es un recurso clave para comprender las relaciones genotipo-fenotipo.
  • Los alelos actúan como perturbaciones dentro de los sistemas biológicos, influyendo en los rasgos a través de procesos genéticos como la recombinación y la segregación.

Objetivo del estudio:

  • Aprovechar la variación genética natural para inferir relaciones causales entre genotipo y fenotipo.
  • Desarrollar modelos de redes causales probabilísticas que mapeen el paisaje genotipo-fenotipo.

Principales métodos:

  • Utilizando cruces genéticos para aleatorizar la distribución de alelos en la progenie.
  • Analizar las respuestas de los rasgos a perturbaciones genéticas comunes para inferir la causalidad.
  • Construir redes causales probabilísticas basadas en las asociaciones genotipo-fenotipo observadas.

Principales resultados:

  • Demostró que el análisis de las respuestas de los rasgos a las perturbaciones genéticas puede distinguir entre causa y efecto.
  • Estableció un marco para inferir relaciones causales a partir de datos de variación genética.
  • Inició la construcción de modelos que representan el mapa genotipo-fenotipo.

Conclusiones:

  • La variación genética natural proporciona una herramienta poderosa para diseccionar las complejas relaciones genotipo-fenotipo.
  • Las redes causales probabilísticas ofrecen un enfoque prometedor para modelar el mapa genotipo-fenotipo.
  • Comprender los vínculos causales es crucial para predecir los resultados fenotípicos de la información genética.