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Each sperm must contain these chromosomes and mostly they are carried together with the dna. When they are matched together then they are used to determine the sex of the baby. For females they have xx chromosomes, while in males they contain xy chromosomes which determine the sex of the. F-bodies as y chromosome markers in mature human sperm heads a quantitative approach. It is generally accepted that at least some y chromosomes in human mature sperm heads are represented in preparations by fluorescent f-bodies. In higher vertebrates, especially mammals, sperm are produced in the testes. The sperm unites with (fertilizes) the ovum (egg) of a female to produce a new offspring. Mature sperm have two distinguishable parts, a head and a tail.   e ditor the widely held idea that spermatozoa bearing the y chromosome (y sperm) swim faster than those bearing the x chromosome (x sperm) seems to have originated from shettless work in 1960, using phase-contrast microscopy. 1 he claimed to have observed two distinct populations of spermatozoa.   the fluorescent dye, quinacrine, binds strongly to the y chromosome and only to a lesser extent to the other chromosomes in human metaphase. Sperm cells that give rise to female (xx) offspring after fertilization differ in that they carry an x-chromosome, while sperm cells that give rise to male (xy) offspring carry a y-chromosome.

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