Y linkage

Y linkage, also known as holandric inheritance (from Ancient Greek ὅλος hólos, "whole" + ἀνδρός andrós, "male"),[1] describes traits that are produced by genes located on the Y chromosome.

[2] While the Y-chromosome is sex-determining in humans and some other species, not all genes that play a role in sex determination are Y-linked.

The Y-chromosome, generally does not undergo genetic recombination except at small pseudoautosomal regions.

[6] Hairy ears are an example of a gene once thought to be Y-linked in humans; however, that hypothesis was discredited.

[5] Due to advancements in DNA sequencing, Y linkage is getting easier to determine and prove.

Hearing impairment was tracked in one specific family and through seven generations all males were affected by this trait.

This is done indirectly by traits that allow the guppy to appear more attractive to a prospective mate.