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Dihybrid Crosses

Dihybrid Crosses

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...

Microbe-Plant Interactions

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Microbe-plant interactions represent a dynamic spectrum of associations shaped by intricate chemical signaling. These interactions can be neutral, beneficial, or detrimental, and profoundly influence plant physiology, growth, and ecosystem function. The plant microbiome, comprising bacteria, fungi, archaea, protists, and viruses, plays a pivotal role in mediating these effects through surface colonization, internal colonization, or systemic symbiosis.Mutualistic associations, particularly with...

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Introduction to Plant Diversity

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Law of Independent Assortment

Law of Independent Assortment

While Mendel’s Law of Segregation states that the two alleles for one gene are separated into different gametes, a different question of how different genes are inherited remains. For example, is the gene for tall plants inherited with the gene for green peas? Mendel asked this question by experimenting with a dihybrid cross; a cross in which both parents are homozygous for two distinct traits resulting in an F1 generation that are heterozygous for both traits.

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Related Experiment Video

Updated: Mar 21, 2026

Experimental Protocol for Manipulating Plant-induced Soil Heterogeneity

Experimental Protocol for Manipulating Plant-induced Soil Heterogeneity

Published on: March 13, 2014

Inter-varietal interactions among plants in genotypically diverse mixtures tend to decrease herbivore performance.

Ian M Grettenberger^1,2, John F Tooker³

¹Department of Entomology, The Pennsylvania State University, University Park, PA, 16802, USA.

|May 13, 2016

Summary

This summary is machine-generated.

Plant genotypic diversity can reduce aphid pests, but drought stress weakens this effect. Understanding these interactions is key for developing pest-resistant crop varieties.

Keywords:

Associational resistance Drought Genotypic diversity Intraspecific diversity Stress

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Published on: July 22, 2017

Area of Science:

Ecology
Agronomy
Entomology

Background:

Plant species diversity effects on herbivores are well-studied.
Effects of plant genotypic diversity and abiotic stressors on herbivores are less understood.
Mechanisms linking plant genotypic diversity to herbivore population dynamics require clarification.

Purpose of the Study:

To investigate how plant neighborhood genotypic diversity affects herbivore performance and fitness.
To determine if drought modifies the influence of plant genotypic diversity on herbivores.
To elucidate the mechanisms underlying plant genotypic diversity's impact on herbivores.

Main Methods:

Greenhouse experiments using wheat (Triticum aestivum L.) and bird cherry-oat aphid (Rhopalosiphum padi L.).
Assessed aphid performance and fitness on focal plants within neighborhoods of varying wheat genotypic diversity.
Manipulated watering regimes to simulate drought conditions.

Main Results:

Plant-plant interactions in diverse neighborhoods reduced aphid performance, indicating associational resistance.
Drought stress significantly diminished the aphid-reducing effects of neighborhood genotypic diversity.
Neighborhood diversity influenced mother aphid size and offspring production, but not focal plant size.
Neighborhood diversity reduced overall plant mass across treatments.

Conclusions:

Interactions among wheat varieties in genotypic mixtures can confer resistance to herbivores.
Abiotic stress, such as drought, can mitigate the pest-management benefits of plant genotypic diversity.
Understanding neighborhood diversity's role in plant resistance is crucial for developing pest-resistant crop mixtures and ecological insights.