What is a juvenile phase?
Sexual reproduction occurs when gametes (haploid cells) from a male and female of the same species fuse to form a diploid zygote - this is a new life. The zygote grows through mitotic cell divisions.
Answer and Explanation:
The juvenile phase is the part of an organism's life after birth and before it can reproduce (before it starts making gametes). In humans, this occurs around the age of 12 for girls when they start ovulating, and 13/14 for boys when they start producing sperm.
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Learn more about this topic:
from Biology 102: Basic GeneticsChapter 6 / Lesson 16