In genetic imprinting, expression depends on the parent of origin of a given allele
How might imprinting affect the expression of a hypothetical autosomal disease that expresses in dominant fashion and recessive fashion, and how might imprinting be detected?
In individuals heterozygous for the dominant allele, expression of a disease phenotype depends on which allele is silenced–and thus which parent donated the disease allele. This will not matter in homozygous recessive individuals with respect to recessively expressing disease alleles. In the former case, imprinting could be detected through analysis of enough pedigrees with known male vs. female heterozygotes and known progeny phenotypes. This would reveal the influence of parent of origin on allele expression.
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Phil has chronic ulcers, he has been taking acid blockers and drinking vast amounts of liquid antacids. These help relieve the symptoms but he still suffers from ulcers. What would be the best course of action to treat the source of his ulcers?
A. Taking several different antacids. B. Increasing the dosage of acid blockers. C. Taking a course of antibiotics. D. Reducing the stress in his daily life. E. Changing his diet to include more fiber. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you already know about ulcers? How does it relate to the question? · What other information is related to the question? Which information is most useful? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Mendeleev found that when he arranged the known elements according to their atomic mass, the entries in the table exhibited a pattern of chemical properties that repeated itself in groups of eight elements. This led to the generalization now known as:
A. an atomic model. B. valance electrons. C. the periodic table. D. the octet rule.
Which of the following characteristics distinguishes birds from reptiles?
a. Reptiles have only one single middle ear bone, while birds have two or more. b. The shape of their occipital condyles allows birds to rotate their heads more than reptiles can. c. Birds are endothermic. d. Birds and reptiles have distinctly different jaw bone morphologies.
If you, like Mendel, grow plants in the lab, and cross short (tt) pea plants with short pea plants, the offspring will be
A. all tall. B. all short. C. nonexistent. D. a mix of tall and short. E. None of the answer choices is correct.