by the presence or absence of special chromosomes. As a result of meiotic segregation‚ each gamete has one sex chromosome to contribute at fertilization. Sex determination is strictly chromosomal and is not usually influenced by the environment. There are two types of sex namely Heterogametic sex: The sex that produces two kinds of gametes and determines the sex of the offspring. Homogametic sex : The sex that produces one kind of gamete Humans‚ have an X-Y mechanism that determines sex at fertilization
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per the scientific lucidity‚ a human has 23 pairs or 46 chromosomes out of which only one pair determines whether a girl or boy will be born and it is also known as sex chromosome. Intrinsically‚ the chromosome of a male is XY and that of a girl is XX. X has female attributes while Y has male attributes. During initial embryonic stage‚ if an embryo has XY chromosome the female attributes are likely to suppress by the genes in the Y chromosomes and eventually the a male child is born and vice versa
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with the X and Y sex chromosomes. These not only carry the genes that determine male and female traits but also those for some other characteristics as well. Genes that are carried by either sex chromosome are said to be sex linked. Men normally have an X and a Y combination of sex chromosomes‚ while women have two X’s. Since only men inherit Y chromosomes‚ they are the only ones to inherit Y-linked traits. Men and women can get the X-linked ones since both inherit X chromosomes. Sex cell inheritance
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human X and Y chromosomes have been completely sequenced. The X chromosome contains 153 million base pairs and harbors a total of 1168 genes. While the Y chromosome contains only 50 million base pairs and is estimated to contain about 251 genes. Educational institutions such as Baylor University‚ the Max Planck Institute‚ the Sanger Institute‚ Washington University in St. Louis‚ and others have spent countless hours and millions of research dollars analyzing these unique chromosomes. As the data
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are born with at least one extra X (sex) chromosome. The symptoms include: learning disabilities‚ personality impairment‚ enlarged breast tissue‚ small/firm testis‚ diminished (pubic‚ axillary‚ and facial) hair‚ tall stature‚ abnormal body proportions (long legs‚ small trunk)‚ and sexual dysfunction. Males that have more than one extra X chromosome often suffer from more severe physical and cognitive symptoms‚ than those with just one extra X chromosome. There is no known cure or specific prevention
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NATIONAL SENIOR CERTIFICATE GRADE 12 LIFE SCIENCES P1 VERSION 2 (OLD CONTENT) FOR PART-TIME CANDIDATES NOVEMBER 2011 FINAL MEMORANDUM – 24/11/11 MARKS: 150 This memorandum consists of 12 pages. Copyright reserved Please turn over Life Sciences/P1 (Version 2) (Part-time) 2 NSC – Memorandum DBE/November 2011 PRINCIPLES RELATED TO MARKING LIFE SCIENCES 2011 1. If more information than marks allocated is given Stop marking when maximum marks is reached and put a wavy line and ’max’ in the
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mother or father? Do twins "run" in your family? These characteristics‚ or traits‚ are inherited. They are passed from your parents to you by genes. Genes (1) ____contain________ DNA that occupies a (2) _________specific_________ place on a chromosome. DNA (3) ___________Determines____________ a specific trait in the (4) ____________organism___________ . Even the fact that you were born a boy or a girl was determined by genes. DNA is found in the (5) __________nucleus_____________ of
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Klinefelter’s Syndrome is a genetic condition that is only found in males and the male is born with an extra copy of the X chromosome. It was first diagnosed by Dr. Harry Klinefelter and his coworker in 1942. They did a group research of men who had the symptoms of Klinefelter syndrome. By late 1950‚ Dr.Klinefelter discovered that the men with Klinefelter syndrome had an extra sex chromosome making them XXY instead of a normal male XY. “Klinefelter’s syndrome occurs in about 1 in 500-1000 male births and
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Film Response to Y Tu Mama Tambien The film Y Tu Mama Tambien was a shocking Mexican film that was directed by Alfonso Cuaron and was released in 2001. It tells the story of two teenage boys‚ Tenoch and Julio‚ and a young woman named Luisa‚ as the three of them take a road trip to a mythical beach that didn’t exist known as “Heaven’s Mouth.” The film was considered extremely controversial because of numerous sex scenes. It was also noteworthy because it portrayed the actual political and economic
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is an additional X chromosome in the cells affecting males. Meiotic nondisjunction is the major result of this syndrome. There are differences in the degree of severity of physical‚ language‚ and behavioral development symptoms between affected individuals. Klinefelter syndrome is not passed from parent to child; even though‚ women who have pregnancies after the age of 35 may have an increased chance of having a boy with the presence of extra sex chromosome. Tests for chromosome disorder before birth
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