In All Sexually Reproducing Organisms,the Diploid Phase of the Life

Question

In all sexually reproducing organisms,the diploid phase of the life cycle begins at
A) spore formation.
B) gamete formation.
C) meiosis.
D) mitosis.
E) fertilization.

Accepted Answer

The diploid phase of the life cycle begins at fertilization when the haploid gametes combine to form a diploid zygote. In sexually reproducing organisms, meiosis occurs to produce haploid gametes from diploid cells, and mitosis occurs to produce more diploid cells for growth and development. However, the diploid phase does not begin until fertilization.