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The Inheritance of DNA, Chromosomes, and Genes
The Inheritance of DNA, Chromosomes, and Genes

... Genes are sections of DNA located at specific loci (sites) on a chromosome. These sections can have anywhere from just over 1,000 DNA bases to several thousand bases. A gene includes DNA bases that code for a specific protein and the additional DNA sequences required for the production of the encode ...
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Gene Expression Profiling of DNA Microarray Data using Association rule and Structural Equation Modeling
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Genetics Powerpoint
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genetics of deafness

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New Genetics Problems
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CIBI3031-070 Midterm Examination III November 2005
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CIBI3031-091 Midterm Examination III November 2005
CIBI3031-091 Midterm Examination III November 2005

... ____ 13. An organism with genotype AaBb is a. homozygous dominant. b. heterozygous. c. homozygous recessive. ____ 14. In eukaryotic cells, which can occur during the stages of mitosis? a. the replication of DNA b. fragmentation and disappearance of the nuclear envelope c. both of these ____ 15. Whic ...
Leukaemia Section t(16;21)(p11;q22) Atlas of Genetics and Cytogenetics in Oncology and Haematology
Leukaemia Section t(16;21)(p11;q22) Atlas of Genetics and Cytogenetics in Oncology and Haematology

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PPT
PPT

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X-inactivation



X-inactivation (also called lyonization) is a process by which one of the two copies of the X chromosome present in female mammals is inactivated. The inactive X chromosome is silenced by its being packaged in such a way that it has a transcriptionally inactive structure called heterochromatin. As nearly all female mammals have two X chromosomes, X-inactivation prevents them from having twice as many X chromosome gene products as males, who only possess a single copy of the X chromosome (see dosage compensation). The choice of which X chromosome will be inactivated is random in placental mammals such as humans, but once an X chromosome is inactivated it will remain inactive throughout the lifetime of the cell and its descendants in the organism. Unlike the random X-inactivation in placental mammals, inactivation in marsupials applies exclusively to the paternally derived X chromosome.
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