About one child in 2,500 is born with PKU this is known as a recessive trait. if the population is in hardy-weinberg equilibrium for this trait what is the frequency of the PKU trait

Of your good in bio kusing a series of preliminary observations; pstate a problem developed from these observations, formulate a hypothesis, design an experiment to test the hypothesis

Which of the organisms listed below performs nitrogen fixation? a. legumes b. plants c. bacteria d. fungi

Imagine a self-reactive t cell that has not undergone clonal deletion in the thymus (that is to say, it has escaped central tolerance). if it encounters self antigen in the absence of an infection or inflammation, what will happen to this self-reactive t cell? (select two answers) (a) the t cell undergoes clonal expansion. (b) the t cell gains effector functions. (c) the t cell undergoes apoptosis. (d) the t cell becomes activated. (e) the t cell becomes anergic.