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Related Concept Videos

Trihybrid Crosses02:27

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 Selection01:21

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 Crosses01:18

Dihybrid Crosses

Overview
Monohybrid Crosses01:20

Monohybrid Crosses

Overview
Incomplete Dominance01:43

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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Chromosomal location of genes controlling seed proteins in species related to wheat.

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Inheritance of glutenin protein subunits of wheat.

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Mapping the nucleolus organizer region, seed protein loci and isozyme loci on chromosome 1R in rye.

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The inheritance of restriction fragment length polymorphisms in the flax rust Melampsora lini.

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Related Experiment Video

Updated: Jul 11, 2026

Sexual Crosses with the Mucoromycete Phycomyces blakesleeanus
05:34

Sexual Crosses with the Mucoromycete Phycomyces blakesleeanus

Published on: June 6, 2025

Multiple Mating-Type Specificities in the Flax Rust Melampsora lini.

G J Lawrence

    Science (New York, N.Y.)
    |July 25, 1980
    PubMed
    Summary

    Flax rust fungus Melampsora lini mating is not a simple system. Genetic control of mating type involves two factors, each with two linked loci, similar to Schizophyllum commune.

    Area of Science:

    • Mycology
    • Plant Pathology
    • Genetics

    Background:

    • Mating systems in fungi are diverse and crucial for sexual reproduction.
    • Understanding mating type determination is key to fungal population genetics.

    Purpose of the Study:

    • To investigate the mating system of the flax rust fungus, Melampsora lini.
    • To determine if Melampsora lini utilizes a simple bipolar mating system.

    Main Methods:

    • Performed selfing and intercrossing experiments with two strains of Melampsora lini.
    • Analyzed the genetic basis of mating type inheritance.

    Main Results:

    • Melampsora lini does not exhibit a simple (+) and (-) mating system.
    • The genetic control of mating type in Melampsora lini is complex.

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    Last Updated: Jul 11, 2026

    Sexual Crosses with the Mucoromycete Phycomyces blakesleeanus
    05:34

    Sexual Crosses with the Mucoromycete Phycomyces blakesleeanus

    Published on: June 6, 2025

    Microscopy of Fission Yeast Sexual Lifecycle
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    Microscopy of Fission Yeast Sexual Lifecycle

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    Determination of the Mating Efficiency of Haploids in Saccharomyces cerevisiae
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    Conclusions:

    • The mating type determination in Melampsora lini is likely controlled by two factors.
    • Each factor is regulated by two linked loci, analogous to the system in Schizophyllum commune.