Explain codominance using the ABO blood groups as an example
What will be an ideal response?
ABO blood types exhibit the phenomenon of codominance, meaning that some alleles are equally dominant and are therefore equally expressed. IA and IB are codominant alleles, while i is recessive. Someone who is IA IB genotype expresses both A and B antigens on the surface of their red blood cells and thus has blood type, or phenotype, AB.
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The majority of cancers are caused by
A) a sedentary lifestyle. B) negative thoughts. C) genetic factors. D) contact with a person who has cancer. E) chemical exposure or other environmental factors.
Compared to the nervous system, the endocrine system has
A. more localized and short-term effects. B. more widespread and long-lasting effects. C. more localized and long-lasting effects. D. more widespread and short-term effects.
A simple squamous epithelium is specialized for:
a. Adaptation to rapid changes in the volume of a hollow organ b. Diffusion of molecules between a lumen and underlying connective tissue c. Movement of mucus within the respiratory system d. Protection of underlying connective tissue from abrasion or desiccation e. Secretion of proteins into a lumen
What molecule(s) cause(s) a portion of a DNA molecule to unwind for transcription?
A. poly—A tail B. transcription factors C. spliceosomes D. RNA ploymerase E. 7—methylguanosine cap