Video Experimental Relacionado
Updated: Jun 21, 2026
05:24
Determining the Egg Fertilization Rate of Bemisia tabaci Using a Cytogenetic Technique
Published on: April 1, 2019
Selección, depresión de reproducción y la proporción de sexos de los insectos de escamas
Science (New York, N.Y.)
|April 1, 1983
Resumen
La proporción de sexos de los insectos de escamas de hoja de pino negro, con machos haploides y hembras diploides, está influenciada por la adaptación y el flujo genético. Las poblaciones de insectos bien adaptadas muestran una mayor proporción de machos, lo que indica una selección natural.
Área de la Ciencia:
- Biología del insecto Biología del insecto
- Genética de poblaciones genética de poblaciones.
- Ecología evolutiva ecología evolutiva.
Sus antecedentes:
- El insecto de escama de hoja de pino negro exhibe un sistema único de determinación del sexo con machos haploides y hembras diploides.
- Comprender la dinámica de la proporción de sexos es crucial para el manejo de la población de insectos y los estudios evolutivos.
Objetivo del estudio:
- Para investigar los factores que influyen en la proporción de sexos en las poblaciones de insectos de escala de hoja de pino negro.
- Para determinar la relación entre la adaptación de la planta huésped y la determinación del sexo en esta especie.
Principales métodos:
- Muestreo de subpoblaciones de insectos en diferentes árboles huéspedes (pinos de Ponderosa).
- Cuantificación de las relaciones hombre-mujer en etapas tardías del desarrollo.
- Analizando los cambios en las proporciones de sexo en muestras anuales sucesivas.
Principales resultados:
- Las proporciones observadas varían significativamente (0.005 a 0.320) entre las subpoblaciones.
- Las demas de insectos con mayor adaptación a árboles huésped individuales exhibieron una mayor proporción de machos.
- Las proporciones de sexo cambiaron hacia una mayor proporción masculina con el tiempo, correlacionándose con una mayor adaptación.
- El flujo genético entre demas en diferentes árboles huésped dio lugar a alteraciones predecibles de la proporción de sexos.
Conclusiones:
- La adaptación de la planta huésped y el flujo genético son factores significativos de la variación de la proporción de sexos en los insectos de escamas de hoja de pino negro.
- La selección natural favorece una mayor proporción de machos en poblaciones bien adaptadas, lo que influye potencialmente en el éxito reproductivo.
- El estudio destaca la intrincada interacción entre las interacciones huésped-parásito y las estrategias reproductivas de los insectos.
Videos de Conceptos Relacionados
01:20Mate Choice
Mate choice—the decision about whom to mate with—is a type of natural selection, since animals must reproduce to pass down their genes. Mate choice is also called intersexual selection because the behavior occurs between the sexes.
01:17Understanding Species and Reproductive Barriers
A species is a group of organisms that interbreed and produce fertile offspring. Typically, individuals of the same species appear similar and share common characteristics due to their highly similar genomes. However, not all organisms that look alike are members of the same species. Various mechanisms keep most species discrete. While some mechanisms prevent reproductive behavior and fertilization (pre-zygotic isolation), others prevent the production of fertile offspring after mating has...
01:09Mutation, Gene Flow, and Genetic Drift
In a population that is not at Hardy-Weinberg equilibrium, the frequency of alleles changes over time. Therefore, any deviations from the five conditions of Hardy-Weinberg equilibrium can alter the genetic variation of a given population. Conditions that change the genetic variability of a population include mutations, natural selection, non-random mating, gene flow, and genetic drift (small population size).Mechanisms of Genetic VariationThe original sources of genetic variation are mutations,...
02:27Background and Environment Affect Phenotype
Although the genetic makeup of an organism plays a major role in determining the phenotype, there are also several environmental factors, such as temperature, oxygen availability, presence of mutagens, that can alter an organism’s phenotype.
An example of how genetic background affects phenotype can be seen in horses. The Extension gene in horses is responsible for their coat color. A wild-type gene (EE) produces black pigment in the coat, while a mutant gene (ee) produces red pigment. A...
An example of how genetic background affects phenotype can be seen in horses. The Extension gene in horses is responsible for their coat color. A wild-type gene (EE) produces black pigment in the coat, while a mutant gene (ee) produces red pigment. A...
02:45The Ratio of X Chromosome to Autosomes
In most organisms, sex is determined by the ratio of X and Y chromosomes. However, in some organisms, such as Drosophila and C.elegans, sex is determined by the ratio of the number of X chromosomes to the number of sets of autosomes. The Y chromosome in Drosophila is active but does not determine sex. It contains genes responsible for the production of sperms in adult flies.
Normal male Drosophila has a ratio of one X chromosome to two sets of autosomes. In contrast, normal female Drosophila...
Normal male Drosophila has a ratio of one X chromosome to two sets of autosomes. In contrast, normal female Drosophila...
01:06Natural Selection and Mating Preferences
The principle of natural selection posits that organisms better adapted to their environment are more likely to survive and reproduce. This principle is closely intertwined with mating preferences, a key aspect of sexual selection, which evolutionary psychologists believe is driven by instincts to propagate one's genes. Such instincts significantly influence mating behaviors and preferences between genders.
Females, due to their biological roles in conception, pregnancy, and nursing, inherently...
Females, due to their biological roles in conception, pregnancy, and nursing, inherently...