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Genetics Unit Pre-Test HW-66
Genetics Unit Pre-Test HW-66

... 4. Hunter found some termites in a wooden board sitting in his backyard, so he sprayed some insecticide on the board to kill the termites. Hunter noticed that about 95% of the termites died, but 5% survived. What is the most likely explanation for this? I know this! A. The living termites were a dif ...
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BIO201InheritanceWeb
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... c. Phenotype: If you get two of the same allele (ex, bb), you must express (show) that trait- you will have blue eyes. However, often when you get two different alleles, one expresses and the other does not. For example, if your genotype is Bb, only the Brown allele expresses, and you will have brow ...
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grade: / 125

... 18. Name  and  briefly  describe  two  approaches  (one  sentence  or  less  per  approach)  that  can  be  used   to  identify  genes  that  cause  Mendelian  diseases.  (3  POINTS)   Linkage  approaches:  scan  markers  across  the  gen ...
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Genomic imprinting

Genomic imprinting is the epigenetic phenomenon by which certain genes are expressed in a parent-of-origin-specific manner. If the allele inherited from the father is imprinted, it is thereby silenced, and only the allele from the mother is expressed. If the allele from the mother is imprinted, then only the allele from the father is expressed. Forms of genomic imprinting have been demonstrated in fungi, plants and animals. Genomic imprinting is a fairly rare phenomenon in mammals; most genes are not imprinted.In insects, imprinting affects entire chromosomes. In some insects the entire paternal genome is silenced in male offspring, and thus is involved in sex determination. The imprinting produces effects similar to the mechanisms in other insects that eliminate paternally inherited chromosomes in male offspring, including arrhenotoky.Genomic imprinting is an inheritance process independent of the classical Mendelian inheritance. It is an epigenetic process that involves DNA methylation and histone methylation without altering the genetic sequence. These epigenetic marks are established (""imprinted"") in the germline (sperm or egg cells) of the parents and are maintained through mitotic cell divisions in the somatic cells of an organism.Appropriate imprinting of certain genes is important for normal development. Human diseases involving genomic imprinting include Angelman syndrome and Prader–Willi syndrome.
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