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Genetics 314 Spring, 2004
Genetics 314 Spring, 2004

... of an inversion. In addition the duplications and deletions that lead to the partial sterility will not occur unless there is a cross-over within the inverted region. 10. You discover two cases of Down’s syndrome, one caused by aneuploidy and the other caused by translocation. a) Cytogenetically how ...
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... Your instructor does not care which partner worked the hardest. The lab must be completed on time. 2. Each partner must pick up five Popsicle sticks -- one of each color of autosome, and one sex chromosome stick. Each side of a stick represents a chromosome, and the two sides together represent a pa ...
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...  The 23rd pair of chromosomes are XX for a female and XY for a male.  Mom can only pass on her X chromosome, but dad can pass X or Y.  Dad determines if offspring is male or female.  Dads give their Y to sons, Moms always give their X to their sons Sex linked traits-traits on this pair of chromo ...
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Unit IX Teacher Notes 2017
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Inheritance Patterns in Dragons
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Chapter 4
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... than females and males generally have more severe characteristics. It is the most common form of an inherited CID. • Lesch-Nyhan disorder is associated with a gene on the X chromosome that results in self-injurious behavior, aggression, and CIDs. • Rett disorder is a dominant neurodevelopmental diso ...
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... * Males are more severely affected than females; in the case of red-green color blindness, Females who have one copy of the mutant gene (that is, are heterozygous or carriers) are not at all affected * Among offspring of carrier mothers, 50% of their sons are affected, whereas 50% of their daughters ...
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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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