Sex Linked Inheritance, Sex Linkage, Sex Linked Characters, Genes Controlling Body Characters, Located on the Sex, Colour Blindness

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Your Ad Here	Sex Linked Inheritance The transmission of body characters from parents to offspring along with sex is called sex linked inheritance It is also called sex Linkage. The genes controlling body characters located on the sex chromosomes are called sex linked genes. The body characters (other than sex characters) controlled be genes located on the sex chromosomes are called sex linked characters. Sex linked inheritance was discovered by T.H. Morgan in 1910.
The following are the common examples for sex-linked inheritance: 1. Colour blindness 2. Haemophila 3. Eye colour in Drosophila 4. Hypertrichosis(Hair in the ear pinna) 5. Ichthyosis hystrix. The sex linked genes are located on X chromosome or Y chromosome or both X and Y chromosome.
The genes, controlling body characters, located on X chromosome are called X-linked genes. The inheritance of X-linked genes is called X- linked inheritance. The characters controlled by X- linked genes are called X- linked characters. Eg. Haemophilia, colour blindness, eye colour in Drosophila. The genes controlling body characters located on Y chromosome are called Y- linked genes. The inheritance of The inheritance of linked genes is called linked genes is called Y- linked inheritance.	Your Ad Here
The characters controlled by Y- linked genes are called Y- linked characters. E.g Hypertrichosis (hair in the pinna), Ichthyosis hystrix (scales on the body). The genes controlling body characters located on both X and Y chromosome are called XY linked genes. The inheritance of XY linked genes is called XY linked inheritance. Y- linked inheritance. The characters controlled by XY linked genes are called XY linked inheritance. E.g. Xeroderma pigmentosum, Retinitis pigmentosa, nephritis, etc. Most of the sex linked characters are recessive. They are more common in man than in woman.
Your Ad Here	Most of the sex linked genes follow criss-cross inheritance(zig-zag inheritance). The inheritance of a character from the father to his grandson through his daughter is called criss-cross inheritance. That is, the sex linked character appears only in alternate generations.

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