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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 chance to...

Monohybrid Crosses

Monohybrid Crosses

Monohybrid Crosses

Monohybrid Crosses

Hybrid Zones

Hybrid Zones

Hybrid zones are narrow regions where two closely related species interact, mate, and produce hybrids. Relative to either parent species, hybrids may possess distinct phenotypic or genetic differences that impact their survival and reproductive success. The genetic variances introduced by hybridization influence species diversity and speciation processes within the hybrid zone.Gene flow and natural selection are evolutionary mechanisms that shape the outcome of a hybrid zone. Gene flow...

Genetics of Speciation

Genetics of Speciation

Speciation is the evolutionary process resulting in the formation of new, distinct species—groups of reproductively isolated populations.The genetics of speciation involves the different traits or isolating mechanisms preventing gene exchange, leading to reproductive isolation. Reproductive isolation can be due to reproductive barriers that have effects either before or after the formation of a zygote. Pre-zygotic mechanisms prevent fertilization from occurring, and post-zygotic mechanisms...

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Related Experiment Video

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

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[Genomic instability in sunflower interspecific hybrids].

I N Anisimova, L G Tumanova, V A Gavrilova

|September 23, 2009

Summary

Genomic instability in sunflower hybrids (ISHs) and introgressive lines (ILs) was confirmed at molecular and phenotypic levels. Mobile genetic elements (MGEs) like MuDR, Far1, CACTA, Stowaway, and Tourist were identified, offering potential for sunflower genotyping.

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Environmentally Induced Heritable Changes in Flax

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Published on: January 26, 2011

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Environmentally Induced Heritable Changes in Flax

Environmentally Induced Heritable Changes in Flax

Published on: January 26, 2011

Area of Science:

Plant genetics
Molecular biology
Genomics

Context:

Investigating genomic instability in interspecific hybrids (ISHs) and introgressive lines (ILs) of cultivated sunflower (Helianthus annuus).
Assessing instability at phenotypic (morphological, protein electrophoresis) and molecular (DNA amplification) levels.
Examining variation in ISHs and ILs derived from crosses with perennial Helianthus species.

Purpose:

To study the expression and characteristics of genomic instability in sunflower interspecific hybrids and introgressive lines.
To determine the role of genome shock and mobile genetic elements (MGEs) in inducing genomic variation.
To explore the potential of MGE fragments for sunflower genotyping.

Summary:

Genomic instability was observed in sunflower interspecific hybrids and introgressive lines, evidenced by phenotypic traits and molecular markers (RAPD).
Identical polymorphic variants in seed storage protein (helianthinin) and DNA fragments suggest nonrandom genome variation, potentially induced by interspecific hybridization.
Active mobile genetic elements (MGEs), including MuDR, Far1, CACTA, Stowaway, and Tourist, were identified, correlating with genomic reorganizations.

Impact:

Demonstrates the nonrandom nature of genome variation in sunflower interspecific hybrids, likely driven by genome shock.
Highlights the significant role of mobile genetic elements (MGEs) in inducing genomic instability and variation.
Establishes the potential utility of MGE fragments for developing novel genotyping methods in sunflowers.