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Mechanisms[ edit ] All animals have a set of DNA coding for genes present on chromosomes. In humans, most mammals, and some other species, two of the chromosomes , called the X chromosome and Y chromosome , code for sex. In these species, one or more genes are present on their Y chromosome that determine maleness. In this process, an X chromosome and a Y chromosome act to determine the sex of offspring, often due to genes located on the Y chromosome that code for maleness. Offspring have two sex chromosomes: Humans[ edit ] Human male XY chromosomes after G-banding In humans, half of spermatozoons carry X chromosome and the other half Y chromosome.This APA books contends that Darwin's theory of sexual selection is the best vehicle for studying how men and women pursue one of life's most fundamental. Gender differences in sexuality were examined by comparing the sexual experience, enjoyment of various activities, and favourite fantasies of men and. ABSTRACT. We studied male and female sexual behavior and sat- isfaction during pregnancy. Expectant fathers were less emotionally satisfied than their wives...the end of the story look at the video above ↑ ↑ ↑
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