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According to the biology class in the school days, we know that XX refers to women and XY refers to men
The evolution of sex chromosomes
Sex chromosomes are obtained from "normal" chromosomes (autosomes) after acquiring a new sex-determining mutation
In mammals, this process occurred about 165 million years ago, resulting in an XY system with a male-specific Y chromosome
With the help of a new generation of genome sequencing methods that allow the comparison of the genomes of the sexes, a new world of sex chromosomes has been discovered in fish: during their evolution, different chromosomes developed independently in different fish lineages as sex chromosomes
Cichlids are particularly diverse
A research team from the Department of Environmental Sciences of the University of Basel is currently studying the evolution of sex chromosomes in a highly diverse fish group, the Cichlid family in Lake Tanganyika, Africa
The researchers analyzed a large amount of genome and transcriptome data of approximately 240 cichlid species to understand the differences between females and males, allowing them to identify the sex chromosomes of more than 70 species
"This means that these fish maintain a record of conversion between vertebrate sex chromosomes
DOI
10.
