Question

What is karyogamy, also known as amphimixis?

Options

• The formation of the first polar body during oogenesis

• The fusion of the male pronucleus and female pronucleus to form the diploid zygote

• The breakdown of the nuclear envelope during meiosis

• The separation of sister chromatids during anaphase

Answer 1

Karyogamy (also called amphimixis) is the fusion of the male pronucleus (from sperm head) and the female pronucleus (from ovum) to form the diploid zygote (2n). This is the final event of fertilization.