Genetic recombination occurs by which process?
independent assortment
crossing over
chromosome segregation
sister chromatids

What causes darkening of the skin as melanin production increases

If the rna molecule in a human has the nucleotide sequence of guu, this would the amino acid valine would be needed to make the protein. how would this cha process was occurring in a mushroom?

Which line in the graph above best illustrates an effect of the carbon dioxide level in the blood on breathing rate before, during and after a period of exercise? 1.b,2.c,3.a,4.d