What was the scientist erwin chargaff role in the discovery of the structure of dna?

Compare and contrast the adaptations of free-living flatworms and parasitic flatworms

What type of cell is produced after fertilization occurs and the gametes combines ?

Aresearcher has developed two stains for use with seed plants. one stains sporophyte tissue blue; the other stains gametophyte tissue red. if the researcher exposes pollen grains to both stains, and then rinses away the excess stain, what should occur? a) the pollen grains will be pure red.b) the pollen grains will be pure blue.c) the pollen grains will have red interiors and blue exteriors.d) the pollen grains will have blue interiors and red exteriors.