Sex Limited Trait

A sex-limited trait is limited to only one sex due to anatomical differences. Such trait affects a structure or fuction of the body present in only males or only females. These traits may be controlled by sex-linked or autosomal genes. Genes for milk yield in dairy cattle affect only cows. Similarly beard growth in humans is limited to men. A woman does not grow a bread herself but she can pass the genes specifying heavy beard growth to her sons.

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Genes and Alleles - Variation and Gene

Genes: 

     Gene (Or.genos = Birth,race) are the basic units of inheritance consisting of a sequence of DNA that occupies a specific position called locus on a chromosomes and is capable of a biological expression. It is the means by which one or more specific characteristics are passed on from parents to offspring.

Alieles: 

     Gr. allelon = of one anothe): Any pf the possible alternative forms of the same gene, of which every individual inherits two (one from each parent), different combinations of which produce different characteristics.

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