Video Experimental Relacionado

Updated: Mar 3, 2026

Whole-mount Clearing and Staining of Arabidopsis Flower Organs and Siliques

Whole-mount Clearing and Staining of Arabidopsis Flower Organs and Siliques

Published on: April 12, 2018

El origen de los girasoles domesticados existentes en el este de América del Norte

Abigail V Harter¹, Keith A Gardner, Daniel Falush

¹Department of Biology, Indiana University, Bloomington, Indiana 47405, USA. avharter@bio.indiana.edu

|July 9, 2004

Resumen

La domesticación del girasol definitivamente se originó en el este de América del Norte, a pesar de la evidencia que sugiere orígenes mexicanos. El análisis genético revela un cuello de botella significativo durante la domesticación de este cultivo importante.

Área de la Ciencia:

La arqueobotánica es la arqueobotánica.
Genética La genética.
La historia de la agricultura La historia de la agricultura La historia de la agricultura La historia de la agricultura La historia de la agricultura La historia de la agricultura La historia de la agricultura La historia de la agricultura

Sus antecedentes:

El este de América del Norte es un centro independiente propuesto de la agricultura.
El girasol (Helianthus annuus L.) fue considerado un domesticado clave del este de América del Norte.
Descubrimientos recientes en México desafían esta hipótesis de origen.

Más Videos Relacionados

Reliable Method for Assessing Seed Germination, Dormancy, and Mortality under Field Conditions

Reliable Method for Assessing Seed Germination, Dormancy, and Mortality under Field Conditions

Published on: November 6, 2016

Methods for Performing Crosses in Setaria viridis, a New Model System for the Grasses

Methods for Performing Crosses in Setaria viridis, a New Model System for the Grasses

Published on: October 1, 2013

Videos de Conceptos Relacionados

Introduction to Seed Plants

Introduction to Seed Plants

Most plants are seed plants—characterized by seeds, pollen, and reduced gametophytes. Seed plants include gymnosperms and angiosperms.

Monohybrid Crosses

Monohybrid Crosses

Dihybrid Crosses

Dihybrid Crosses

The Angiosperm Life Cycle

The Angiosperm Life Cycle

Plants have a life cycle split between two multicellular stages: a haploid stage—with cells containing one set of chromosomes—and a diploid stage—with cells containing two sets of chromosomes. The haploid stage is the gamete-producing gametophyte, and the diploid stage is the spore-producing sporophyte.

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.

Seed Structure and Early Development of the Sporophyte

Seed Structure and Early Development of the Sporophyte

Seed structures are composed of a protective seed coat surrounding a plant embryo, and a food store for the developing embryo. The embryo contains the precursor tissues for leaves, stem, and roots. The endosperm and cotyledons—seed leaves—act as the food reserves for the growing embryo.