Specialties & Expertise. Dr. Gary Petty has the following 7 areas of expertise, 1 specialty and 1 board certification. Family Medicine. A family practitioner is a doctor who specializes in caring for people of all ages, at all stages of life.
Base Pairing. The rules of base pairing (or nucleotide pairing) are: A with T: the purine adenine (A) always pairs with the pyrimidine thymine (T) C with G: the pyrimidine cytosine (C) always pairs with the purine guanine (G) ... [users.rcn.com/jkimball.ma.ultranet/BiologyPages/B/...]
Report Abuse. DNA is interior the type of a double helix. the backside pairing rule describes the complementarity of the bases. Adenine is going with Thymine; Cytosine with Guanine. the cost of this would not lie in guy or woman bases, yet fairly interior the final base sequence.