Prader-Willi syndrome and Angelman syndrome are both caused by the same genetic deletion on human chromosome 15, but they have very different phenotypes. Whether one or the other syndrome occurs depends upon which parent provided the chromosome with the deletion. What is this pattern of inheritance an example of?

a. sex-linked inheritance
b. cytoplasmic inheritance
c. genomic imprinting
d. uniparental inheritance


Ans: c. genomic imprinting

Biology & Microbiology

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__________ is a gradual variation in phenotypes and genotypes over a geographic span

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In bacterial toxins of the A-B type, the A fragment is responsible for (1) __and the B fragment is responsible for (2)__.

A. (1)Toxin activity (2) binding to cells B. (1) Fever production (2) binding to cells C. (1)Attaching to surfaces (2) interfering with nerve function D. (1) Binding to cells (2) stopping protein synthesis E. (1) killing phagocytic cells (2) lysing host cells

Biology & Microbiology

Which is not a factor that contributes to normal cells becoming cancerous?

A) the conversion of a proto-oncogene to an oncogene B) mutations in a tumor-suppressor gene C) the production of more effective tumor-suppressor gene products D) excessive replication of proto-oncogenes

Biology & Microbiology

Which statements correspond to amphibolic pathways? 1. anabolic and catabolic reactions are joined through common intermediate 2. shared metabolic pathways 3. Feedback inhibition can help regulate rates of reactions 4. both types of reactions are necessary but do not occur simultaneously

A) 1 only B) 1, 2, 3 C) 1, 2, 3, 4 D) 2, 4 E) 2, 3, 4

Biology & Microbiology