Keystone Puppies (717) 492-4396 Lancaster, PA. Visit Website . Keystone Puppies: Adoption Services. Keystone Puppies provides dog-lovers with a way to adopt puppies of all different types of breeds. Each of our breeders complies with the necessary laws and regulations relating to the puppies they raise, breed, and the facilities they reside until they make it to your loving home. number of chromosomes 40 diploid DNA content about 6 pg per cell 3X109 bp per haploid genome recombination units 1600 centimorgans (2000 Kb/cM) approximate number of genes§ 0.5 - 1.0 X 105 percent of genome as five families of highly repeated DNA sequences (B1, B2, R, MIF-1, and EC1)¥ 8 - 10%. Reproductive Biology. gestation time 19.