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Comparative Genome Organization in plants: From Sequence and Markers to... and Chromosomes  Summary
Comparative Genome Organization in plants: From Sequence and Markers to... and Chromosomes Summary

... They are discrete components of the plant genome that replicate and reinsert at multiple sites by a complex process. Depending on the method of excision and reintegration, these mobile elements are classified as either Type I, which uses an RNA intermediate, e.g. retrotransposon, or Type II, those e ...
Name: Date: Study Guide: Mitosis and Meiosis Review Genetic
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... f. Haploid or Monoploid – (n) half the number of chromosomes; only one of each homologous chromosome (Human sex cells = 23 chromosomes) g. Gamete – sex cells h. Spermatogenesis: making sperm i. Begins at puberty, ends at death i. Oogenesis: making egg i. Begins at puberty, ends at Menopause – when a ...
1. (a) When a cell divides, the genetic material can divide by mitosis
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... The inheritance of the ability to produce hydrogen cyanide is controlled by two genes which are located on different chromosomes. The dominant allele of one gene, G, controls the production of enzyme G which converts a precursor to linamarin. The dominant allele of the other gene, E, controls the pr ...
BSC 3402L GENETIC ANALYSIS IN THE FRUIT FLY Summer 1998
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Eugenic Evolution Utilizing a Domain Model / (c)
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DRAGON GENETICS LAB

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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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