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Genetics Concept Check Answers Concept Check 10.1 Particulate
Genetics Concept Check Answers Concept Check 10.1 Particulate

... 1. Males require only one recessive trait in the X chromosome. Females must have recessive on both. 2. No. The son must get a Y chromosome from the father, which does not carry the allele. ...
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PDF

... to the septum of the heart outflow tract to allow for separation of the systemic and pulmonary circulations. It is not known, however, whether cardiac NC cells are also involved in outflow tract septation in amphibians. Here, Lee and Saint-Jeannet show that cardiac NC cells are dispensable for outfl ...
1) The creation of genetically identical offspring by a single parent
1) The creation of genetically identical offspring by a single parent

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Reading: The Cells of Genetic Continuity

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F factor
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... Most of the cells in a human contain two copies of each of 22 different chromosomes. In addition, there is a pair of chromosomes that determines sex: a female contains two X chromosomes and a male contains one X and one Y chromosome. Transmission of genetic information to offspring occurs through eg ...
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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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