AP BIOLOGY

Detailed explanation-1: -At puberty, there is an increase in testosterone levels; this initiates meiosis I. During this stage, a primary spermatocyte generates two secondary spermatocytes, which then undergo meiosis II. Two haploid spermatids (haploid cells) are generated by each secondary spermatocyte, resulting in a total of four spermatids.

Detailed explanation-2: -Secondary spermatocytes, which are present for only about 8 hours, undergo a second meiotic division (meiosis II) to form haploid spermatids.

Detailed explanation-3: -The haploid secondary spermatocytes undergo meiosis II to produce four haploid spermatids.

Detailed explanation-4: -A primary spermatocyte is transformed into two secondary spermatocytes during meiosis I-these cells then in turn are converted into (1N) spermatids during meiosis II.

Detailed explanation-5: -Diploid cells within the testes undergo meiosis to produce haploid sperm cells with 23 chromosomes. A single diploid cell yields four haploid sperm cells through meiosis.