What accounts for genetic material from each of an organism's parents being present in sperm and egg cells?

a) regeneration of new cells

b) crossing over during mitosis

c) cytokinesis of new cells
2

d) crossing over during meiosis

Taq polymerase is an enzyme isolated from the organism thermophilus aquaticus. this organism has been found living in the hot springs of yellowstone national park. this enzyme is used to copy human dna from crime scenes. most reactions are performed at ranges similar to those of the human body; however, what considerations should be made for optimum use of this enzyme? view available hint(s)taq polymerase is an enzyme isolated from the organism thermophilus aquaticus. this organism has been found living in the hot springs of yellowstone national park. this enzyme is used to copy human dna from crime scenes. most reactions are performed at ranges similar to those of the human body; however, what considerations should be made for optimum use of this enzyme? the enzyme will not work on human dna. nothing should be altered. the ph should be decreased. the temperature should be raised.

The activity of the modern sample is 1.10 bq . how long does that measurement take?

Is there any solid scientific evidence that humans have been cloned?