Huntington's disease is a disorder of the brain that strikes people in middle to late adulthood. People with this disease have a mutation in a protein involved in intracellular transport. Clumps of this protein build up over time in the brain, which causes destruction of brain cells involved in thinking, emotions, and motion, and eventually leads to death. Anyone who inherits one copy of this gene is destined to suffer from the disease. That individual, in turn, has a 50% chance of passing the mutation along to a child. At present, there is no treatment for Huntington's disease. Which of the following is an important ethical question that could be posed about this disorder? 0 A. How can researchers use modern genetic techniques to better understand how brain cells die as the disease progresses? O
B. Are their variations in phenotypic expression of Huntington's disease, and if so, do any environmental factors play a role that could be applied in treatment plans? 0 C. Are genetic tests for the Huntington's mutation 100% reliable? O
D. Could prenatal testing for the Huntington's mutation lead to artificial selection against human disabilities?

In 1959, doctors began using the powerful antibiotic methicillin to treat infections of staphylococcus aureus, but within two years, methicillin-resistant strains of s. aureus (mrsa) appeared. how did the resistant strains of s. aureus emerge? in 1959, doctors began using the powerful antibiotic methicillin to treat infections of staphylococcus aureus, but within two years, methicillin-resistant strains of s. aureus (mrsa) appeared. how did the resistant strains of s. aureus emerge? staphylococcus aureus bacteria that were able to synthesize cell walls using a protein that was not affected by methicillin survived the methicillin treatments and reproduced at higher rates than did other individuals. over time, these resistant individuals became increasingly common. in response to treatment of staphylococcus aureus infections with methicillin, some bacteria began to synthesize cell walls using a protein that was not affected by methicillin. these bacteria survived the methicillin treatments and reproduced at higher rates than did other individuals. over time, these resistant individuals became increasingly common. in response to treatment of staphylococcus aureus infections with methicillin, bacterial populations gradually began to synthesize cell walls using a protein that was not affected by methicillin.

What is the most appropriate method of gaining weight (muscle mass)

Punnett squares are used to show possible combinations of alleles or to predict the probability of a trait occurring in offspring. an incomplete dominance cross is performed between a bird that is homozygous for red feathers and a bird that is homozygous for blue feathers. purple offspring result. then, two of the purple offspring are crossed. according to the punnett square for this cross, how many of the offspring from the second cross will have a feather color that results from incomplete dominance? 1 in 4 2 in 4 3 in 4 4 in 4