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Mobile pieces of DNA - transposable elements - that insert themselves into chromosomes and accumulate during evolution make up more than 40% of the human genome. Element of four types - long interspersed elements (LINEs), short interspersed elements (SINEs), LTR transposons and DNA transposons - are inserted more or less randomly throughout the human genome. These elements are conspicuously rare at the four homeobox gene clusters, HoxA, HoxB, HoxC, and HoxD, as illustrated for HoxD in Each Hox cluster is about 100 kb in length and contains 9 to 11 genes, whose differential expression along the anteroposterior axis of the embryo establishes the basic body plan for humans (and for other animals). Why do you suppose that transposable elements are so rare in the Hox clusters?
The Young and the Restless has a couple people that suffer from a rapid aging syndrome that involved a young child that is sent off to boarding school and returns three months as an teenager.
At which level of protein structure are peptide bonds the most important.
In mice, dwarfism is caused by an X-linked recessive allele, and pink coat is caused by an autosomal dominant allele. If a dwarf female from a pure line is crossed with a pink male from a pure line, Determine the phenotypic ratios in the F1 and F2 in..
Early formulation of the medium used a smaller amount of carbohydrate and occasionally produced false alkaline result after forty-eight hours.
A student, who has not learned properly how to prepare solutions, added 25.7 g of sucrose to exactly 150.0 mL of dH2O and assumed that a 0.5 M solution had been prepared. The total solution volume increased to 168.0 ml after sucrose was dissolved and..
A bacteria has the following lac operon genes located on the chromosome: I+P-Z-Y-A+. On a plasmid, this same bacterial cell has the lac genes I-P+Z-Y+A-. a) Which Lac proteins will be made? b) What type of protein expression (induced or constituit..
A previous study has shown that freckles gene is located at the locus marked F, and hair color gene is located at the locus marked H, both on the long chromosome.
Determine the number of significant digits in each number and write out the specific significant digits.
When evolution occurs we would expect different regions with similar enviornments to all contain the same mix of plants and animals.
Humans are parts of food chains and food webs, too. Where on a food web would you typically find humans (near the bottom with the producers, at the top with carnivores, or somewhere in between)?
What type of promoters are found in the T-DNA that control oncogenes and opine synthesis genes? What is the basis for tumor formation in the Agrobacterium-plant? What causes the tumor to form? What products of the bacteria are needed to cause plan..
A certain allele of the ApoE gene in humans has been linked to an increase in susceptibility to Alzheimer's disease, which causes dementia. What is the advantage for higher eukaryotes to include introns within their pre-mRNA transcripts?
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