What term refers to the sequence of events initiated by a sperm entering a mature oocyte and followed by the formation of pronuclei?

What term refers to the sequence of events initiated by a sperm entering a mature oocyte and followed by the formation of pronuclei?

• A. Implantation
• B. Fertilization
• C. Zygote formation
• D. Meiosis

Answer: (B)

Fertilization is the process that begins when a sperm penetrates a mature oocyte and triggers its activation. This sequence leads to the egg completing meiosis II and forming two pronuclei—the male pronucleus from the sperm and the female pronucleus from the egg. The subsequent fusion of these pronuclei (syngamy) produces the zygote. Implantation happens later when the zygote implants into the uterine lining, and meiosis refers to the division that creates haploid gametes, not the events that follow sperm entry. So fertilization best fits the described sequence because it encompasses sperm entry followed by pronuclei formation.

Fertilization is the process that begins when a sperm penetrates a mature oocyte and triggers its activation. This sequence leads to the egg completing meiosis II and forming two pronuclei—the male pronucleus from the sperm and the female pronucleus from the egg. The subsequent fusion of these pronuclei (syngamy) produces the zygote. Implantation happens later when the zygote implants into the uterine lining, and meiosis refers to the division that creates haploid gametes, not the events that follow sperm entry. So fertilization best fits the described sequence because it encompasses sperm entry followed by pronuclei formation.