Ojarike and A. Science 69— The answer lies in an observation that was made by the geneticist Mary Lyon. A, Thomas J. C "cupcake" : sperm head is no longer elongated, the caudal side is wider than in A and B categories, and opens up to a wide dorsal side; hint of a hooked tip can be sometimes be seen.
During its final phase, spermiogenesis, haploid round spermatids undergo cellular differentiation into spermatozoa, which involves extensive restructuring of cell morphology, DNA, and epigenome. Origins of genetic variation in sexually reproducing populations.
A, Tremethick D. Microarray analyses performed on these Sly -deficient males and on MSYq-deficient males show a remarkable up-regulation of sex chromosome genes in spermatids. Support Center Support Center. Greaves I.