QUESTION 50 Expression of the maternal vs paternal alleles for the Igf2 gene is determined by: O Histone methylation and DNA methylation. OX-chromosome inactivation (XCI). Imprinting control region (ICR) and DNA methylation. X-chromosome inactivation (XCI) and DNA methylation. QUESTION 51 Patient P shows symptoms of an autosomal recessively inherited disease. None of her siblings, parents, or children show symptoms of the disease. Patient P's father's sister had the disease and so did Patient P's maternal grandmothér. Patient P inherited the disease causing allele from: Her mother only. Her father only. Both her mother and father. Neither her mother nor father – it must be from spontaneous mutations.

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Defense Mechanism

Circumstances influence and compel people to behave in a certain way. One such behavior is a defense mechanism. It is employed by people to escape from unpleasant circumstances, thoughts and actions. Defense mechanisms are, thus, psychological strategies that help to avert and avoid unwanted feelings such as guilt or shame and situations such as threat and danger.