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Ploidy Manipulation of Zebrafish Embryos with Heat Shock 2 Treatment

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Parthenogenesis and developmental constraints.

Frietson Galis¹, Jacques J M van Alphen¹

¹Naturalis Biodiversity Center, Leiden, The Netherlands.

Evolution & Development

|October 18, 2019

Summary

This summary is machine-generated.

Parthenogenesis evolution faces two main constraints: missing centrosomes and chromosomes. These barriers are overcome by drastic meiotic changes, often triggered by cytological events, enabling new forms of asexual reproduction in animals.

Keywords:

aneuploidy centrosome endosymbiosis evolutionary constraints hybridization meiosis mitosis pleiotropy wolbachia

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Area of Science:

Evolutionary biology
Developmental biology
Genetics

Background:

Parthenogenesis, or asexual reproduction, is constrained by the lack of paternal genetic material in unfertilized ova.
Two key developmental constraints are the absence of a centrosome and a complete set of chromosomes.

Purpose of the Study:

To explore how parthenogenesis evolves despite these developmental constraints.
To understand the macro-evolutionary implications of overcoming these barriers.

Main Methods:

Review of existing literature on parthenogenesis evolution.
Analysis of cytological events and meiotic changes in taxa exhibiting parthenogenesis.
Comparative analysis across different animal groups.

Main Results:

The absence of a paternal centrosome and chromosome set are significant barriers to parthenogenesis.
These constraints can be overcome through drastic changes in meiosis, often facilitated by events like hybridization or infections.
Once established, various forms of parthenogenesis can evolve, including shifts from facultative to obligate reproduction.

Conclusions:

The combined constraints create a substantial barrier to the gradual evolution of regular facultative parthenogenesis.
This may explain the rarity of regular facultative parthenogenesis and its absence in vertebrates.