Answer
Genomic imprinting is a phenomenon in which the expression of a gene (genes) depends on whether the gene(s) came from father; in other words, this ia a " parent-of -origin- gene- expression."
Examples of human conditions in which genomic printing operates are Praeder Willi syndrome, Angelmann syndrome, Beckwith Wiedeman syndrome and Albright hereditary osteodystrophy. In Prader Willi and Angelman syndromes autosome #15 is involved. In both these conditions a part of chromosome # 15 is deleted. If the defective chromosome is inherited from the father, the syndrome that results is called Praeder Willi syndrome. However, if the defective #15 is transmitted by the mother, the syndrome that results is called Angelmann syndrome.
Work Step by Step
Some symptoms and signs (SS) of Praeder Willi are learning disability, short stature, hypogonadism and obesity. Some ways in which Angelmann's syndrome may be expressed are learning difficulties, speech problems, ataxia, depression, and hyperactivity.
