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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...

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Updated: Jun 16, 2025

An Allele-specific Gene Expression Assay to Test the Functional Basis of Genetic Associations

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Published on: November 3, 2010

Simple Sequence Repeat-Based Genetic Diversity Analysis of Alfalfa Varieties.

Jie Wang^1,2, Xiaoli Wei^1,2, Changying Guo¹

¹Academy of Animal Science and Veterinary Medicine, Qinghai University, Xining 810016, China.

International Journal of Molecular Sciences

|June 13, 2025

Summary

Simple sequence repeat (SSR) markers effectively identified 49 alfalfa varieties, revealing high genetic diversity. These SSR markers offer valuable tools for alfalfa breeding and conservation efforts.

Keywords:

SSR alfalfa forage breeding

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Published on: February 20, 2012

Area of Science:

Plant genetics
Forage science
Molecular biology

Background:

Alfalfa (Medicago sativa) is a vital forage crop with high nutritional value.
Identifying alfalfa varieties is challenging due to phenotypic similarity and environmental influences.
Accurate variety identification is crucial for breeding, registration, and conservation.

Purpose of the Study:

To evaluate the effectiveness of simple sequence repeat (SSR) markers for discriminating alfalfa varieties.
To assess the genetic diversity and population structure of 49 alfalfa germplasm samples.
To explore the application of SSR markers in alfalfa breeding and germplasm management.

Main Methods:

Screening of 23 simple sequence repeat (SSR) markers against 49 alfalfa varieties.
Analysis of polymorphic fragments, allele numbers, and polymorphic information content (PIC).
Population genetic diversity analysis, including analysis of molecular variance (AMOVA), genetic distance, and cluster analysis.

Main Results:

21 out of 23 SSR markers exhibited high polymorphism, with an average of 5.91 alleles and a PIC of 0.66.
Significant genetic diversity was observed among the tested alfalfa materials.
AMOVA indicated that within-population variation was the primary source of total genetic variation.
Cluster analysis identified two main genetic subgroups, with distinct genetic distances between populations.

Conclusions:

SSR markers are highly effective for the precise genetic characterization and discrimination of alfalfa varieties.
The study confirms substantial genetic diversity within the analyzed alfalfa germplasm.
SSR marker technology holds significant value for alfalfa breeding programs, variety registration, and germplasm resource conservation.