Why does a cell make a copy of its dna before it divides?

The phylogenetic tree illustrates the relationship between humans and our closest living relatives. the tree was based on biochemical comparisons, including dna and amino acid sequences. according to the biomolecular data, we could infer that a) the four organisms do not have a common ancestor. b) humans are more closely related to chimps than any other apes. c) chimps are more closely related to gorillas than they are to humans. eliminate d) there is no evidence if any relationship between the four branches on the tree.

Why does it matter if osmosis is put into a “scab” or a “nosebleed? ” where would that leave him?

Genetic disorders can result when sister chromatids fail to seperate properly. during what phase is this problem most likely to occur?