Scientists have discovered a mutation in female drosophila flies that results in infertility. the mutation causes phosphorylation of an amino acid in histones, preventing the histones from binding to dna during cell division. histones are proteins that exist in the nucleus and that package dna into organized units.

explain how this mutation would most likely affect a drosophila fly’s cells during mitosis and meiosis.
explain how phosphorylation of an amino acid could affect chromosomes and cell division, based on how dna, histones, and chromosomes are related.

Ascientist is investigating the effects of salinity on fish development. he places fertilized fish eggs in an aquarium that contains low salinity and observes their development. what factor would improve experimental design the most? place the fish eggs in the open ocean because that is the natural habitat include another aquarium that has normal salinity to compare to the low salinity aquarium include an aquarium that replaces salt with sugar to confirm that the effects are specific to salt grow algae with the fish eggs in order to provide adequate nutrients to the developing embryos