Define sex linked inheritance.

Define sex linkage.

Explain gene switch on and off mechanism in E.coil. Sex linked inheritable diseases mostly affects men. Explain it with an ex-ample.

Note the relationship between the first two words and suggest a suitable word for the 4^(th) place. a. XX - XO mechanism - Grasshopper: XX - XY mechanism b. Sex limited inheritance - Beard in man: Sex influenced inheritance - c. Phenylketonuria - Phenylalanine hydroxylase: Alkaptonuria - d. Down syndrome - Langdon Down : Klinefelter's syndrome - e. Turner's syndrome - 45 chromosomes: Down's syndrome - f. Ascaris megalocephala - 2:Ophioglossum reticulatum

Give examples of X-linked gene inheritance in humans.

Identify the Non-Mendelian inheritance.

Explain the inheritance of sex linked characters in human being .

Extranuclear inheritance is called as cytoplasmic inheritance. Why ?