Other results point to the hypothesis of sex-linked genes, or, inheritance through the maternal chromosome.

Do you know about sex-linked gene deficiencies?

Within poultry, sex-linked genes have been used to create hybrids in which males and females can be sorted at one day old by color.

That is, females carrying a sex-linked gene of dwarfism are always pure and exhibit the trait.

Feathering growth in the first weeks of life is genetically controlled by a few autosomal genes and a sex-linked gene.

Sex-linked gene, Rod thought.

However, heterogametic hybrids, which carry only a single copy of a given sex-linked gene, will be affected by mutations regardless of dominance.

White eyes in Drosophila melanogaster flies- the first sex-linked gene discovered in Drosophila.

Hutt and Mueller (1942) found a partial albinism in bronzed turkeys determined by a simple sex-linked gene, which is semi-lethal during incubation period or later.

Another contributors to the unequal male-female aggression ratio are the sex-linked gene mutations that affect only male behaviour, such as MAO-A mentioned above.

Most of the genetical variation among breeds can be explained by sex-linked gene K. Autosomal genes retarding feathering growth are not typical in any particular breed.

The first sex-linked gene ever discovered was the "lacticolor" X-linked recessive gene in the moth Abraxas grossulariata by Leonard Doncaster.

Dominance rules for sex-linked gene loci are determined by their behavior in the female: because the male has only one allele, that allele is always expressed regardless of whether it is dominant or recessive.

According to one theory the cause for this is a higher frequency of genetic recombination in women than in men, possibly due to sex-linked genes, and as a result women tend to show less phenotypical variation in any given population.