Biology 2003 JAMB Past Questions - Question 42: A feature associated with the Y-chromosome in humans is

Correct Answer

C

Explanation

In human males, the Y-chromosome has a few genes not found on the X-chromosome. These few genes determine the development of the testes. The testes have two important tissues namely seminiferous tubules for spermatozoa production and interstitial cells for the production of testosterone responsible for secondary sexual characteristic such as facial hairs, moustache, enlarged chest, elongation of peins, development of beard and discharge of semen. Long eyelashes and prominent finger nails are body characters determined by autosomes that is other forty four haploid chromosomes. Enlarged breast occurs in women caused by hormone called estrogen secreted by ovary at puberty.