x and y chromosomes on a white background.

allele background biochemistry biology blood cell cells centromere chromatid chromatids chromatin chromosome chromosomes diagram didatic division dna female gender gene genetic genome heterologous heterozygous homologous homozygous human illustration information inheritance leukocytes linked male maternal medicine microbiology microscopic mitosis molecule mononuclear polymorphonuclear replication reproduction science sex sexual structure telomere types vector white