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Hereditary Determination of Sex Primary sex determination- Concerns the determination of the gonads In mammals determination strictly chromosomal not influenced by the environment Most cases- female XX male XY Every individual organism has atleast one X Chromosome Since the female has 2 X chromosomes each of her eggs posses one X chromosome The male posses an X and a Y so therefore the male can produce 2 kinds of sperm one with an X chromosome and one with a Y chromosome If an offspring receives an X and a Y then it will be a male TheY chromosome carries a gene that encodes a testis determining factor If a person had an innumerable number of x chromosomes and one y chromosome they would be male If a person is born with only a single x chromosome and no second x or y then they develop as a female but are infertilenot able to maintain ovarian follicles More Primary Sex Determination- In the is absence of the Y chromosome the primordial gonad body develops into ovaries the ovary then produces the estrogenic hormones which contains estrogen and other such hormones enabling the development of the Mullerian duct into the uterus fallopian tubes and upper end of the vagina In the presence of Y chromosome the testes form The testes secrete two major enzymes The first hormone AMHanti-Mulllerian duct hormone destroys to Mullerian duct The second testosterone stimulates the masculinization of the fetus During this process the penis scrotum and other male anatomical structures form The development of the primordial breast is inhibited The body therefore has the female phenotype unless it is altered by two hormones created in the fetal testes The development of gonads is the only fetal organ development process that has the chance of developing into more than one organ under normal circumstances and barring
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