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Name: Sex-Linked Inheritance The study of inheritance of genes
Name: Sex-Linked Inheritance The study of inheritance of genes

... The study of inheritance of genes located on sex chromosomes was pioneered by T. H. Morgan and his students at the beginning of the 20th century. Although Morgan studied fruit flies (Drosophila), the same genetic principles apply to humans. A. Some genes on sex chromosomes play a role in sex determi ...
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... 63. Theory of pangenesis was proposed by Darwin 64. The concept of Genotype and Phenotype was introduced by W Johanssen 65. Chromosome theory of heredity was proposed by W S Sutton 66. Germ plasm theory was put forward by Weismann 67. The nationality of Gregor Mendel who is regarded as “father of ge ...
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... mouth posture with tongue protrusion. Hearing is typically normal, but speech and language do not develop, which is another hallmark of the syndrome. You think it’s tough being a speech-language pathologist or audiologist and having to learn all this! Be glad you’re not a DNA molecule. One of my pr ...
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NonMendelian Inheritance Patterns
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Lesson 12: Single Trait Inheritance student notes
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... several chromosomes. Make certain that the sex-linked traits are placed on the X chromosomes. Because there are several sex-linked traits, there will be several genes listed on each X chromosome. Remember to use only one X chromosome for a male and 2 for each female. Too many or not enough X chromos ...
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... - A gene is a segment of a chromosome. There are many genes within a chromosome that control the inheritance of a particular gene. - The position of a gene on a chromosome is called a locus. Diploid organisms have 2 copies of a gene – or 2 alleles – one on each homologous chromosome. - Alleles = alt ...
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Y chromosome



The Y chromosome is one of two sex chromosomes (allosomes) in mammals, including humans, and many other animals. The other is the X chromosome. Y is the sex-determining chromosome in many species, since it is the presence or absence of Y that determines the male or female sex of offspring produced in sexual reproduction. In mammals, the Y chromosome contains the gene SRY, which triggers testis development. The DNA in the human Y chromosome is composed of about 59 million base pairs. The Y chromosome is passed only from father to son. With a 30% difference between humans and chimpanzees, the Y chromosome is one of the fastest evolving parts of the human genome. To date, over 200 Y-linked genes have been identified. All Y-linked genes are expressed and (apart from duplicated genes) hemizygous (present on only one chromosome) except in the cases of aneuploidy such as XYY syndrome or XXYY syndrome. (See Y linkage.)
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