On Fig. 4.1, indicate whether each labelled cell is haploid or diploid. Use $n$ if the cell is haploid and $2n$ if the cell is diploid.
Spermatogenesis includes meiosis, mitosis, growth and maturation. For each of the steps below, state which process is involved in spermatogenesis. spermatogonium to primary spermatocyte spermatid to spermatozoan (sperm)
Suggest why some people who oppose genetically modified insect-resistant maize or cotton might accept the growing of this genetically modified wheat.
State one function of a Sertoli cell.
Outline the treatment that is needed to obtain mature oocytes as part of an IVF procedure.
Using Table 4.1, describe how adding reproductive hormones affects spermatid development after 48 hours.
Suggest one reason for the apparent fall in the percentage of elongated cells between 24 hours and 48 hours in some samples.
Suggest why the culture medium was kept at $30\,^{\circ}\text{C}$ rather than at core body temperature ($37\,^{\circ}\text{C}$).
Suggest one reason for the apparent fall in the percentage of elongated cells between 24 hours and 48 hours in some samples.