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Trihybrid Crosses

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...

Frequency-dependent Selection

Frequency-dependent Selection

When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.Positive Frequency-Dependent SelectionIn positive...

Dihybrid Crosses

Dihybrid Crosses

Monohybrid Crosses

Monohybrid Crosses

Incomplete Dominance

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.

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Especificidades del tipo de apareamiento múltiple en el lino Melampsora lini lini.

Science (New York, N.Y.)

|July 25, 1980

Resumen

El hongo de la roya de lino Melampsora lini el apareamiento no es un sistema simple. El control genético del tipo de apareamiento implica dos factores, cada uno con dos loci vinculados, similar a Schizophyllum commune.

Área de la Ciencia:

La micología de la micología.
Patología Vegetal Patología vegetal.
Genética La genética.

Sus antecedentes:

Los sistemas de apareamiento en los hongos son diversos y cruciales para la reproducción sexual.
Comprender la determinación del tipo de apareamiento es clave para la genética de las poblaciones de hongos.

Objetivo del estudio:

Para investigar el sistema de apareamiento del hongo de la roya del lino, Melampsora lini. lini.
Para determinar si Melampsora lini utiliza un sencillo sistema de apareamiento bipolar.

Principales métodos:

Realizó experimentos de autocruce y cruce con dos cepas de Melampsora lini. lini.
Analizó la base genética de la herencia del tipo de apareamiento.

Principales resultados:

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Melampsora lini no exhibe un sistema de apareamiento simple (+) y (-).
El control genético del tipo de apareamiento en Melampsora lini es complejo.

Conclusiones:

Es probable que la determinación del tipo de apareamiento en Melampsora lini esté controlada por dos factores.
Cada factor está regulado por dos loci vinculados, análogo al sistema en Schizophyllum commune.