During which stage of a cells cycle do the replicated chromosome thicken and become visible

Glutamic acid: hydrophilic or hydrophobic? positive, negative, or neutral? valine: hydrophilic or hydrophobic? positive, negative, or neutral?

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

This is a situation in which genes are attached to an organism's sex chromosomes; the sex of an organism influences the expression of a gene.