Skip to main content
Biology LibreTexts

25.26: Glossary: Z

  • Page ID
    17850
  • zero population growth (ZPG)

    equilibrium condition in which the human population is neither increasing nor decreasing in size because the birth rate equals the death rate

    zona pellucida

    protein layer surrounding the cell membrane of a human egg

    zoonosis (plural, zoonoses)

    infectious disease of nonhuman animals that can be transmitted to humans

    zygote

    diploid cell that forms when two haploid gametes unite during fertilization