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Monohybrid Crosses

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Speciation describes the formation of one or more new species from one or sometimes multiple original species. The resulting species are discrete from the parent species, and barriers to reproduction will typically exist. There are two primary mechanisms, speciation with and without geographic isolation—allopatric and sympatric speciation, respectively.Allopatric SpeciationIn allopatric speciation, gene flow between two populations of the same species is prevented by a geographic barrier, like...

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Measuring Endoreduplication by Flow Cytometry of Isolated Tuber Protoplasts

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An Overlooked Paleotetraploidization in Cucurbitaceae.

Jinpeng Wang^1,2, Pengchuan Sun², Yuxian Li^1,2

¹School of Life Sciences, North China University of Science and Technology, Tangshan, Hebei, China.

Molecular Biology and Evolution

|October 14, 2017

Summary

A newly discovered cucurbit-common tetraploidization (CCT) event shaped the genomes of important plants like cucumber and melon. This ancient whole-genome duplication, occurring after a hexaploidy event, reveals insights into Cucurbitaceae family evolution.

Keywords:

Cucurbitaceae gene colinearity genomics homology polyploidy

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Area of Science:

Genomics
Evolutionary Biology
Plant Science

Background:

Cucurbitaceae plants (e.g., cucumber, watermelon, melon) hold significant biological and economic value.
Comparative genomics of Cucurbitaceae genome structures and evolution remains underexplored.

Purpose of the Study:

To perform a hierarchical inference of genomic homology in Cucurbitaceae, focusing on paleopolyploidization events.
To identify and characterize previously overlooked polyploidization events and their impact on genome evolution within the family.

Main Methods:

Hierarchical inference of genomic homology.
Analysis of gene loss and retention patterns following polyploidization events.
Subgenome analysis to infer the nature of polyploidization events.

Main Results:

A cucurbit-common tetraploidization (CCT) event was identified, occurring shortly after a core-eudicot-common hexaploidy.
Gene loss and retention were significantly unbalanced between subgenomes and across divergent lineages.
The CCT event, inferred to be allotetraploid, occurred approximately 90-102 million years ago and is likely common to all Cucurbitaceae.

Conclusions:

The CCT event played a crucial role in the establishment and evolution of the Cucurbitaceae plant family.
Unbalanced gene loss and retention following polyploidization contributed to subgenome dominance and divergence.
This study provides a new framework for understanding the genomic history and evolutionary trajectory of Cucurbitaceae.