Hydrogen bonds Helicase Topoisomerases Pseudoautosomal Regions Barr Body Primases Nondisjunction Hemizygous Telomeres Dosage Compensation Oocytes Ligases Recombinase Hydrophobic bonds Polar Body Spermatocytes Failure of homolog separation in meiosis I or chromatid separation in Meiosis II Cells in the ovaries that undergo meiosis Cells in the testes that undergo meiosis. Cell produced by meiosis that does not become a gamete. Describes genes present in only one copy such as those on the X chromosome in males Enzymes that facilitates the joining of DNA strands together Catalyzes site-specific recombination Responsible for the chemical atfinity between A and T (or G and C ) nucleotides Noncovalent bonds that hold the two strands of the double helix together Processes that equalize the dosage of X-linked gene products in the somatic cells of males and females Structures at the end of eukaryotic chromosomes Condensed X chromosome in XX somatic cells The tips of the X and Y chromosomes Enzymes that synthesize short RNA sequences called primers Enzymes that separate two hybridized nucleic acid strands.