Genetics

How did all the racial physical differences become what they are? I mean how did blacks and south asians and aboriginese end up with dark skin? How did asians end up with slanted eyes?

Anybody out there want to try writing professionally? Want to pass on an opportunity. A Science & Tech site is looking for great writers knowledgeable about science and genetics. Requirements: Bright Hub, the leading Hub for science and technology, has a Genetics Channel with open writer positions. We’re looking for writers who have a deep knowledge and understanding of fundamental genetics and gene-based technologies, and the implications for society that comes from this research. Equally as important is a deep passion for communicating complex ideas to the public in a clear and concise manner. Topics that are covered in the Genetics channel include biochemistr…

Hi I would like to know about telomeres and immortality. How come humans have an increased chance of developing cancer when their telomeres are lengthened whereas trees can live several thousand years healthily. and what is the ALT path to reconstructing telomeres. can someone give me an answer or point me in the right direction. Thank you.

or does one DNA molecule = all the chromosomes, ie, all the genetic material in our cells?

Animals are often cloned by the method of 'somatic cell nuclear transfer'. suppose, a cow which is about 10 years old is cloned by method of SCNT, its somatic cell nucleus has the genes which already have the information of how old the cow is i.e 10 yrs. now in this method, the complete nucleus of the somatic cell is transfered to an egg-cell of a donor. then this zygote is implanted artificially into another cows womb. After a new calf(clone) is born, will its initial age be 10 years? will its 1st birthday be its 10th birthday? Average lifespan of a cow is about 20 yrs, so will this CLONED COW live only 10 years more? Waiting for input....

So, dna is a molecule, a long chain molecule, also known as a macromolecule, because it's large, and also known as a polymer. Polymers are made of many molecules called monomers that are linked together to make the long chain molecule. The monomers of the dna polymer (macromolecule, long chain molecule) are molecules called nucleotides. I don't know why they're called that except that nucleo- refers to be found in the nucleus. These "nucleotides" are made out of groups of atoms, one being a phosphate group, meaning that it's made out of the phosphate polyatomic ion and something else, but I don't know what, a pentose sugar, and I don't know what a pentose sugar is, an…

can plant cell be engineered to absorb more co2 also birds with choroplast built into their wings

Is the technology advanced enough to manufacture and modify viruses to perform specific tasks?

So life and reproduction is all about passing on our genes to the next generation, right? But we're not passing on OUR genes, we're passing on our grandparent's genes, and our great-grandparent's, etc. After several dozen generations, are there any of "our own" genes left that are getting passed on? Would our ancestors of 65 million years ago appreciate that "their" genes are still being passed on by us... assuming we're still small, vole-like creatures? In another 65 million years, how many of our genes will be "in the pool", and if the answer is a big fat zero, well, what does that say about the importance of reproduction?

so http://learn.genetics.utah.edu/content/begin/tour/ is a website that i looked at to learn as much as possible about genetics, and on the link it talks about in the dna section{the first one on the top left of the little black screen} how only a and t can connect, and c and g can connect. yet in the next slide it shows how they get put as dna and include what appears to be random sequencing orders, is that just a typo or am i misenterpriting? thanks.

I know the question seems to make no sense, but I swear I've seen them. Twin siblings who look perfectly identical in every way except for their sex. If you've ever seen that show John and Kate Plus 8, you'll know what I mean. They have six-tuplets, 3 girls and 3 boys, and the girls look identical to each other and so do the boys. Can this ever happen?

I wanted to ask this question and i have problems finding infomation and due to the fact there are very helpful people on this site i give it a shot. I know that bacteria can swap genetic material and created a merged bacteria of some sort but my question is it possible for two virues to swap genetic material,if so how and what would be the outcome?

hi all, i'm trying to include some population genetics information in a paper i'm currently writing and i've come across a problem with a paper i'd like to use. the pubmed link is as follows (i also attached the paper): http://www.ncbi.nlm.nih.gov/pubmed/16804517?ordinalpos=1&itool=EntrezSystem2.PEntrez.Pubmed.Pubmed_ResultsPanel.Pubmed_DefaultReportPanel.Pubmed_RVDocSum Now for my two questions: 1.) what is the difference between relative risk (RR) and genotype relative risk (GRR)? 2.) what do the numbers under the different models in table 2 mean? why does recessive model have infinity for each study included in the meta-analysis? i'm thinkin…

The [math]\lambda[/math] bacteriophage has one of the most extensively studied 'molecular switches' in molecular genetics. The Cro/cI system appears to control the decision of the virus to go into a lytic or lysogenic cycle. cI is mainly responsible for lysogeny, and Cro [+cII] for lysis. I know that the occupation of the rightward operator (O[math]_{}R[/math]) and its three binding sites (O[math]_{}R[/math]1,O[math]_{}R[/math]2,O[math]_{}R[/math]3) determine the repression of P[math]_{}R[/math] and P[math]_{}L[/math], and hence halt Cro expression. They form an octamer with the leftward operator and 'bend' the DNA. But what is it in the bacterium that leads to a …

i guess i have to be quicker writing my post as I seemed to have been logged out for inactivity!!! I have a question that has been puzzling me since studying biology of the cell and basic genetics Why is it that the Barr body only forms in the XX phenotype and not the XY phenotype, i.e. how does one X chromosome know it has another beside it? Interestingly while trying to find this out I came across two studies on familial skewed X inactivation stating that where a high inactivation of either the male or female X chromosome occured (it only stated female X chromosome inactivation but I am trying not to be biased here) there was a high incidence of spontaneous …

could it be possible for every cell in an organism be cancerous? if so, what would happen? would it just become a giant lump of excess protein? could a tree have this? could it be alive for a longer amount of time, just growing and growing? would it take in more carbon and give out more oxygen?

Hello everyone, I am studying for a final, and I am trying to figure out how Wobble hypothesis can help us determine how many tRNAs are needed for each amino acid. I understand the hypothesis, but what I have difficulty is to determine what is the minimum amount of tRNAs needed for each amino acid and what is the maximum. For example, if serine has the codons: UCU UCC UCA UCG AGU AGC Then, there has to be two minimum tRNAs, just by looking at the first two nucleotides of the bases. However, our teacher said that there are maximum tRNAs possible as well, if you include that fact that there are some perfect anticodons, and others not as well (ex. the anticodon contai…

Hi, I am doing a project for my college genetics class on the genetic engineering of bacteria. I understand the basic process, but I was wondering if anyone knew of any sources that go into more detail? Thanks

Telomeres prevent chromosomes sticking together and they enable complete replication of chromosomes to occur. Please explain why this is in detail.

My eyes are very unusual. They are different colors, but change colors. My left eye is 3/4 brown with a 1/4 that is blueish greenish and changes size and color randomly. Sometimes it is more 1/2 and 1/2 of each other other times you can barely see the blueish greenish part. My right eye is a greenish blue, but has been known to randomly become silver, completely blue, green, or a dark brown. I first noticed my eyes when I was 4 and have never figured out why they are so random and weird. Many people have noticed them and one genetics doctor only told me that .3% of the population has eyes like mine, but I have never gotten a reason for why they are so random and unus…

"GFAP is a type III IF protein that maps, in humans, to 17q21." -wiki Glial Fibrillary Acidic Protein What does the mapping designation 17q21 stand for? What 'keyes' would I input into a search on this specifically(map convention?)

Does anyone know the genotype/phenotype of the following: off white, chestnut & Palomino horses - all bred from Palomino horses) chestnut = ee, aa, CC, dd, gg, ww, toto palomino = ee, CCr, dd, gg, ww, toto off white = ee, CrCr (Chart based on Dr. Bowling's Genetic Formulas)

Hi all, im new... I'm Fuad and i come from Bosnia. I study biology. Also, my english is bad, so please bear with me. Ok, about my question. Well, they always teach you that RNA has Uracil base, and that DNA has Thymine instead. But I never learned why! Why did DNA molecule evolved that way... why didn't it keep Uracil, why replace it with Thymine?

Tell me about it.

Can anyone please provide me with a book title, or link to a web site, with in-depth information about emergenic traits?