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More than 95% of the Y chromosome is male-specific (4) and a single copy of the Y chromosome is able to induce testicular differentiation of the embryonic gonad. The Y chromosome acts as a dominant inducer of male phenotype and individuals having four X chromosomes and one Y chromosome (49XXXXY) are phenotypically male. (5) When a Y chromosome is present, early embryonic testes develop around the 10th week of pregnancy.
Part 1: Normal male meiosis. In the cell nucleus, chromosomes contributed by this male's mother (in red) and father (in blue) pair up. For clarity, only the X and Y sex chromosomes and 5 of the 22 pairs of autosomes (nonsex chromosomes) are shown. Each chromosome has replicated and consists of two identical chromatids.his means that when the chromosomes of egg and sperm cells combine at fertilization, the embryo regains the normal diploid number. Meiosis mixes up the parental genes in two ways. First, the members of each chromosome pair come together and swap segments in a process known as crossing over, or recombination.