the evolution of genetic material on the y chromosome and its role in gender determination
DESCRIPTION
THE EVOLUTION OF GENETIC MATERIAL ON THE Y CHROMOSOME AND ITS ROLE IN GENDER DETERMINATION. Sam Taylor and Lauren Russell Biology 101H Dr. Jean DeSaix Dr. Moriah Beck April 15, 2009. http://www.youtube.com/watch?v=nlOAnL9xI74. Sex Determination. Women are XX Men are XY - PowerPoint PPT PresentationTRANSCRIPT
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THE EVOLUTION OF GENETIC MATERIAL ON THE Y CHROMOSOME
AND ITS ROLE IN GENDER DETERMINATION
Sam Taylor and Lauren RussellBiology 101HDr. Jean DeSaixDr. Moriah BeckApril 15, 2009
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http://www.youtube.com/watch?v=nlOAnL9xI74
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SEX DETERMINATION
Women are XX Men are XY Primary vs. Secondary sex characteristics
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EVOLUTION OF Y CHROMOSOME
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EVOLUTION OF Y AND SRY
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SRY AND SOX’S(SOX9 AND SOX3)
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SRY ENABLES SOX9 EXPRESSION
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http://www.youtube.com/watch?v=5yia5MmDXFw
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XX MALE SEX REVERSAL SYNDROME
Human genetic disorder characterized by male physical characteristics and XX chromosomal karyotype
In case study, tested to determine why self-identified male is infertile and has undescended testicles
Gel electrophoresis compared subject’s DNA with normal male and normal female DNA
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SRS PATIENT NORMAL MALE
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XX SEX REVERSAL SYNDROME CASE STUDY CONCLUSION
• This subject’s SRS syndromes caused by translocation of father’s SRY gene from Y to X chromosome during meiosis
• Confirmed SRY is required for physical male characteristics to be expressed
• Strengthened hypothesis that SRY silences SOX3 and enhances SOX9 on male X chromosomes
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BIBLIOGRAPHY Delbridge, M. L. & Marshall Graves, J. A. (1999).
Mammalian Y Chromosome Evolution and the male-specific functions of Y chromosome-borne genes. Journals of Reproduction and Fertility, 4(2), 101-109.
Waters, P. D., Wallis, M. C., & Marshall Graves, J. A. (2007).
Mammalian sex-Origin and evolution of the Y Chromosome and SRY. Seminars in Cell & Developmental Biology, 18(3), 389-400.
Schartl, M. (2004). Sex Chromosome evolution in non-mammalian vertebrates.
Current Opinion in Genetics and Development, 14(6), 634-641.
Wang, T., Liu, J. H., Yang, J., Chen, J. & Ye, Z. Q.(2009).
XX Male Sex Reversal Syndrome: A Case Report and Review of the Genetic Basis.
First International Journal of Andrology: Andrologia, 41(1), 59-62.
Campbell, Neil A. and Reece, Jane B. (2008). Biology (Eighth Edition). New York, NY: Pearson Benjamin Cummings. Pearson Education.
secondary sex character. (2009). In Encyclopædia Britannica. Retrieved March 23, 2009,
from Encyclopædia Britannica Online: http://www.britannica.com/EBchecked/topic/531812/secondary-sex-character