DP Biology (last assessment 2024)
Question 18M.2.HL.TZ1.8a
| Date | May 2018 | Marks available | [Maximum mark: 4] | Reference code | 18M.2.HL.TZ1.8a |
| Level | HL | Paper | 2 | Time zone | TZ1 |
| Command term | Describe | Question number | a | Adapted from | N/A |
a.
[Maximum mark: 4]
18M.2.HL.TZ1.8a
(a)
Describe the process of spermatogenesis leading to the production of four sperm cells in a human male.
[4]
Markscheme
a. in the seminiferous tubule
b. diploid cells/spermatogonia grow/enlarge
c. two divisions of meiosis
d. primary spermatocyte carries out the first division and secondary spermatocytes carry out the second division
e. meiosis produces haploid cells/spermatids
f. haploid cells/spermatids differentiate into spermatozoa/sperm cells
OR
develop tail/flagellum/helical mitochondrion/acrosome/sac of enzymes
g. Sertoli cells help sperm to mature/differentiate
Allow answers presented in a clearly annotated diagram.
