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Notes Chapter 12 Human Genetics
Notes Chapter 12 Human Genetics

...  Single-allele traits are controlled by a single allele of a gene. Multiple-allele traits are controlled by three or more alleles of a gene.  Polygenic traits are controlled by two or more different genes.  The genes for X-linked human traits, such as colorblindness, Duchenne muscular dystrophy, ...
Gene Regulation
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... the grandchildren increased, suggesting that this was a transgenerational epigenetic inheritance.[57] The opposite effect was observed for females—the paternal (but not maternal) granddaughters of women who experienced famine while in the womb (and therefore while their eggs were being formed) lived ...
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... A) All of the sons and none of the daughters will have hemophilia. B) All of the daughters and none of the sons will have hemophilia. C) Half of the sons and half of the daughters will have hemophilia. D) Half of the sons and none of the daughters will have hemophilia. E) Half of the daughters and n ...
Gene selection: choice of parameters of the GA/KNN method
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lesson x - MisterSyracuse.com
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... 1. What we need to find out is how genes are controlled. We don’t want them on all the time, but we don’t want them off all the time, either. 2. In prokaryotes, things called operons control the process. 3. There is an operator gene that must be active in order for anything to happen. 4. There is pr ...
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... • One of the benefits of sexual reproduction (over asexual reproduction) is that it provides for abundant variation. • There can be 8 million different combinations of chromosomes produced through meiosis. • Crossing over occurs when homologous chromosomes exchange segments during meiosis. ...
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... • Cotransformation can occur for two genes near each other. • Cotransformation is the probability of simultaneous transformation of two genes. • If the rate of cotransformation is much higher than the product of the individual frequencies, then this implies that the two genes are close to each other ...
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... Drosophila X Chromosome 2b In division 2b of the X chromosome, a strange bulge appears in images of polytene chromosomes In situ hybridization using cosmid clones mapped to that region show hybridization on the outside of this structure, but not in the middle Figure from http://www.helsinki.fi/~sau ...
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... 9. What is produced by each parent and shown along the sides of a Punnett square? GAMETES 10. Who carried out the first studies of heredity? GREGOR MENDEL 11. What did he use to carry out these studies? PEA PLANTS 12. Be able to give possible allelic combinations found in gametes Ex:(Bb, Dd) can be ...
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Human Genetics

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... 7.Which of the following statements about nondisjunction is true? Nondisjunction only results in gametes with n+1 or n-1 chromosomes Nondisjunction occurring during meiosis II results in 50% normal gametes Nondisjunction during meiosis I results in 50% normal gametes. Nondisjunction always results i ...
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9.1 Karyotype, mitosis and meiosis

...  Lyonisation is inactivation of one of X chromosomes in every ...
In humans, hemophilia is an X
In humans, hemophilia is an X

... contains a number of genes that are vital to proper growth and development. In fact, it seems to be impossible for humans to develop without the genes of the X-chromosome. It is particularly easy to spot recessive defects in genes located on the X-chromosome because the genes are expressed more comm ...
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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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