archive-org.com » ORG » B » BIOLOGY-ONLINE.ORG

Total: 791

Choose link from "Titles, links and description words view":

Or switch to "Titles and links view".
  • Biology-Online • View topic - Protein sequence
    know what is the name of protein with sequence cgt tct ata gat acg cga tga cgg tat acc atc cgc aaa gt or how can i identify protein from sequence Thanks a lot for answer becouse I tried couple ways for example BLAST uniprot expasy etc and it didn t work well It is maybe just becouse I don t know how to use them Post a reply Jump

    Original URL path: http://www.biology-online.org/biology-forum/about41479.html (2016-02-17)
    Open archived version from archive

  • Biology-Online • View topic - Need some help in this bio question
    A and a A is completely dominant to a and results in oval rather than round leaves Given the following cross what is the F1 generation Cross Aa x aa a 1AA 2Aa 1aa b 1AA 1aa c 1Aa 1aa d 3Aa 1aa 2 Using the cross in the previous question if you allowed plants with round leaves from the F1 generation to self fertilize could you obtain offspring F2 plants with the genotype AA If so which proportion would you expect a 0 you could not get this genotype b 1 4 would be AA c 1 2 would be AA d 3 4 would be AA 3 Using the cross from the previous questions if you allowed plants with oval leaves from the F1 generation to self fertilize could you obtain offspring F2 plants with the genotype AA If so which proportion would you expect a 0 you could not get this genotype b 1 4 would be AA c 1 2 would be AA d 3 4 would be AA 4 What proportion of the F2 offspring produced in the previous question would you expect to have oval leaves a 0 you could not get this genotype

    Original URL path: http://www.biology-online.org/biology-forum/about41475.html (2016-02-17)
    Open archived version from archive

  • Biology-Online • View topic - need help with some home work
    there is a gene T which codes for the tallness character So depending on the alleles which have been expressed the person can turn out to be tall if he has Tt heterozygous or TT homozygous Here T is the dominant trait over t whereas the person will become dwarf only if both the alleles for the gene is tt I hope this explanation of mine made some sense Hence as answer of your question there is no question of the baby being heterozygote The baby WILL HAVE a recessive trait ONLY 2 If you understood what I said above then I think you will have answer to the second question as well now The baby will definitely be homozygous dominant because both mom and dad are homozygous dominant for the particular trait Notice why I am writing HOMOZYGOUS dominant because the baby can also be HETEROZYGOUS dominant if it has Tt pair of allele for tall character but for recessive allele its not the case it HAS TO BE tt 3 You are absolutely right Tip You can always make a cross to check if these kind of questions confuse you I hope this helps and please feel free to ask me any kind of doubts in this Reply with quote Youngji Youngji Posts 4 Joined Sun Jan 11 2015 11 00 am Re need help with some home work Sun Feb 01 2015 1 14 pm I agree with Athira here Your first two answers are wrong You can visualize a cross aa x aa will never give Aa genotype for a baby AA X AA will never give a Aa baby oN THE FACE of it if you have a parent Aa cross with AA you should get a baby with either AA or Aa right However

    Original URL path: http://www.biology-online.org/biology-forum/about41398.html (2016-02-17)
    Open archived version from archive

  • Biology-Online • View topic - 6 fingers
    remove it at birth for cosmetic purposes People who have Polydactyly have muscle and nerve function in the sixth digit as well as a bone You will need to ask your parents if there was an X ray performed to determine whether or not there was a bone in there and that will let you know if you carry the dominant gene My professor is a Geneticist and I would believe her over anything read on Wikipedia I just checked out the link and it has inaccurate information listed But then again my professor could make a mistake but being her small lecture on Polydactyly centered upon distinguishing it from extra skin that may form I tend to believe her You should never perform your own surgery because you can risk serious infection and uncontrolled bleeding or worse You have a lot of bacteria on your skin and no matter how well you think you clean it it s never clean enough The tools you use would also not be sterile and you also do not know how to perform surgery that s why doctors go to school for many years so that they can learn properly You could cut a vein or an artery and then you would be in big trouble not to mention that doctors don t just cut off parts like that There is a fine technique that utilizes lasers sutures and sometimes even skin grafting something you are incapable of performing in your own home If the skin is bothersome and causing pain or getting in the way you could see if your insurance will cover the removal Otherwise you would have to pay a plastic surgeon to remove it Reply with quote BrentElmer BrentElmer Posts 4 Joined Fri Jan 30 2015 7 02 am Re 6 fingers Fri Jan 30 2015 7 10 am The presence of an extra sixth finger or toe a very common congenital malformation birth defect This condition is called hexadactyly The word hexadactyly literally means six digits In medical usage hexadactyly does not specify whether the six digits are fingers or toes although in Greek dactylos is without equivocation a finger The 6th digit can be located in three different locations on either side of the extremity or somewhere in between With the hand for example the extra finger can be out beyond the little finger which is called ulnar hexadactyly or out beyond the thumb radial hexadactyly or finally between two of the normally expected fingers intercalary hexadactyly Far and away the most frequent form of hexadactyly is ulnar postaxial hexadactyly Next comes radial preaxial hexadactyly And far and away the rarest form of hexadactyly is intercalary hexadactyly Hexadactyly in itself can be innocuous absolutely harmless and very easily remedied when the hexadactyly is an isolated finding and the baby is otherwise entirely normal Ulnar hexadactyly with just a rudimentary tag of a sixth digit for instance can be very simply treated by tying it off with one

    Original URL path: http://www.biology-online.org/biology-forum/about24186.html (2016-02-17)
    Open archived version from archive

  • Biology-Online • View topic - Double heterozygous cross HELP
    the mice I need to cross the parents and I would like what would be their progeny like the possibilities So I need to cross female mouse Gene A fl Gene B Cre X male mouse Gene A fl Gene B Cre would the progeny be 25 Gene A fl 50 Gene A fl Gene B Cre 25 Gene B Cre or I need to do the 16 square Punnett

    Original URL path: http://www.biology-online.org/biology-forum/about41442.html (2016-02-17)
    Open archived version from archive

  • Biology-Online • View topic - Allelic exclusion
    quote jannat jannat Posts 6 Joined Sun Sep 29 2013 8 24 am Allelic exclusion Thu Jan 22 2015 4 19 am Why do B cells undergo allelic exclusion at all why they dont show normal dominant recessive pattern Post a reply Jump to Select a forum General Biology General Discussion Cell Biology Molecular Biology Zoology Discussion Evolution Microbiology Bioinformatics Human Biology Botany Discussion Genetics Physiology Ecology Biology Documents Biology

    Original URL path: http://www.biology-online.org/biology-forum/about41422.html (2016-02-17)
    Open archived version from archive

  • Biology-Online • View topic - I have got some BIG issues! forgive the long post
    GPB products of two tightly linked genes of the glycophorin gene family each present in two different allelic forms The antigens are very weak even though after repeated transfusions they may provoke a synthesis of the antibodies anti M and anti N Due to their simple codominant way of inheritance their detection serves as one of the criteria during paternity trials The antigens S and s are linked to the M and N antigens It is supposed that they occupy a single locus in a form of four different alleles MS Ms Ns and NS Rh The human Rh system with more than 40 antigens is the most complex and together with the ABO system has profound clinical significance Fisher Race Theory which explains its complex nature is named after the two British workers who proposed it in the 1940 s Although too simplistic to explain this complex system the theory is useful to explain routine inheritance of D C E c and e antigens The main tenets of the theory are as follows 1 Rh inheritance is controlled by 3 closely linked loci on each chromosome of a homologous pair 2 Each locus has its own set of alleles which are Dd Cc and Ee The D gene is dominant to the d gene but Cc and Ee are co dominant Today we know that the d gene does not exist when used it represents absence of the D gene 3 The 3 loci are so closely linked that crossing over does NOT occur and the 3 genes on one chromosome are always inherited together Antigens of the Rh blood group system are thus products of RHD and RHCE collectively referred to as RH30 the two tightly linked and highly homologous genes occupying the short arm of the chromosome 1 RhD carries the D antigen as the most potent blood group immunogen but it is absent from a relatively large segment of the population i e Rh negative phenotype mainly as the result of RHD gene deletion RHCE exists in four allelic forms and each allele determines the expression of two antigens in Ce ce cE or CE combination RHCE is the collective name of the four alleles RHD and RHCE genes each contain 10 exons and span 75 kb DNA sequence Complex formation with the product of another single copy gene RHAG also referred to as RH50 is essential for the presentation of the Rh antigenic activity RH50 is similarily organized into 10 exons and shares 36 sequence identity with RH30 but is located at a separate locus While the RH50 locus is almost invariant the RH30 locus harbors a large repertoire of allelic diversity at the level of populations Because crossing over cannot occur the genotype Cde cde is impossible in a child from this mating Even though the father has C d and e genes the Cde and cde on each chromosome are always transmitted to offspring together 31 Medical Biology and Genetics Winter term 2014

    Original URL path: http://www.biology-online.org/biology-forum/about41382.html (2016-02-17)
    Open archived version from archive

  • Biology-Online • View topic - Mendel's Law
    to the next For example a plant with red flowers must carry a gene for that characteristic A gene for any given characteristic may occur in one of two forms called the alleles pronounced uh LEELZ of that gene For example the gene for color in pea plants can occur in the form allele for a white flower or in the form allele for a red color The first step that takes place in reproduction is for the sex cells in plants to divide into two halves called gametes The next step is for the gametes from the male plant to combine with the gametes of the female plant to produce a fertilized egg That fertilized egg is called a zygote A zygote contains genetic information from both parents For example a zygote might contain one allele for white flowers and one allele for red flowers The plant that develops from that zygote would said to be heterozygous for that trait since its gene for flower color has two different alleles If the zygote contains a gene with two identical alleles it is said to be homozygous The application of Mendel s three laws makes it possible to predict the characteristics of offspring produced by parents of known genetic composition The picture on page 1248 for example shows the cross between a sweet pea plant with red flowers RR and one with white flowers rr Notice that the genes from the two parents will segregate to produce the corresponding alleles RR R R and rr r r There are then four ways in which those alleles can recombine as shown in the same picture However all four combinations produce the same result R r Rr In every case the gene formed will consist of an allele for red R and

    Original URL path: http://www.biology-online.org/biology-forum/about40979.html (2016-02-17)
    Open archived version from archive



  •