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Genetic Engineering
Questions about the manipulation of an organisms genes in order to alter the morphological or chemical traits of the organism.
1,707 Questions
What are the advantages and disadvantages of B.T. Cotton?
- The level of toxin expression can be very high thus delivering sufficient dosage to the pest.
- The toxin expression is contained within the plant system and hence only those insects that feed on the crop perish.
- The toxin expression can be modulated by using tissue-specific promoters, and replaces the use of synthetic pesticides in the environment. The latter observation has been well documented world-wide.
There was also a report in Nature, that Bt maize was contaminating maize in its center of origin.[26] Naturelater "concluded that the evidence available is not sufficient to justify the publication of the original paper."[27] A subsequent large-scale study failed to find any evidence of contamination in Oaxaca.[28]
There is also a hypothetical risk that for example, transgenic maize will crossbreed with wild grass variants, and that the Bt-gene will end up in a natural environment, retaining its toxicity. An event like this would have ecological implications, as well as increasing the risk of Bt resistance arising in the general herbivore population. However, there is no evidence of crossbreeding between maize and wild grasses.
As of 2007, a new phenomenon called Colony Collapse Disorder (CCD) is affecting bee hives all over North America. Initial speculation on possible causes ranged from cell phone and pesticide use[29] to the use of Bt resistant transgenic crops.[30] The Mid-Atlantic Apiculture Research and Extension Consortium published a report on 2007-03-27 that found no evidence that pollen from Bt crops is adversely affecting bees. CCD has since been attributed to a new virus, unrelated to Bt crops.[31]
What are two main ways in which human genetics follows the genetic patterns seen in other organism?
First, meiosis independently assorts chromosomes when gametes are made for sexual reproduction and second, human heredity involves the same relationsips between alleles-dominant and recessive interactions, polygenic traits, and sex-linked genes.
Plants are expected to be genetically engineered to have?
resistance to the elements (such as cold and hail) and pests. Also they're engineered to have a larger crop
Is addison's disease a genetic?
NO, it is not genetic, Although the disease is hell and if you have it, like I do, I feel very sorry for you and please take care of yourself and be sure to carry information on your disease because it is rare that Emergency rooms know anything about this rare disease.
Discuss the issues related to genetic mutations: sexual reproductions, migration and population size
Serum is generally free from blood cellular components but when collecting serum sometimes few cells will be pipetted with the serum & that is the only source of DNA in the serum.
Founder effect refers to the loss of genetic variation when a new colony is established by a very small number of individuals from a larger population. As a result of the loss of genetic variation, the new population may be distinctively different.
Bottleneck effect is an evolutionary event in which a significant percentage of a population or species is killed or otherwise prevented from reproducing, and the population is reduced by 50% or more, often by several orders of magnitude.
Population bottlenecks increase genetic drift, as the rate of drift is inversely proportional to the population size.
They also increase inbreeding due to the reduced pool of possible mates.
Is a cell that has one copy of its genetic information in each cell?
A haploid cell has only one set of chromosomes, so it carries one copy of genetic information in each cell. This differs from diploid cells, which have two sets of chromosomes. Haploid cells are typically found in germ cells for reproduction.
How is water necessary for the structure of green plants?
Water is essential for green plants for several reasons: it maintains turgor pressure in plant cells to keep them rigid and upright, it is involved in photosynthesis as a reactant, and it aids in nutrient transport throughout the plant. Without water, plants wilt, cannot photosynthesize effectively, and struggle to uptake nutrients.
How does incomplete dominance function at the molecular level?
One funcional allele is insufficient to produce the dominant pheontype. Both alleles are expressed as an intermediate of the alleles.
Does prokaryotic cells use DNA to code genetic information?
Yes. With the exception of some viruses which use RNA, all organisms on Earth code their genetic information on DNA. In some cases prokaryotes use a modified genetic code where a few codons will have different meanings than they do in eukaryotes, but broadly speaking, the DNA genetic code is a universal feature of all known organisms.
Describe the difference between a single digest and a double digest?
Restriction enzymes (endonucleases) are used for a variety of reasons in molecular genetics, including
obtaining a "map" and cloning DNA.
Single digests consitute DNA being treated with one restriction endonuclease, whereas double
digests contain 2 enzymes.
At times, it is difficult (or not possible) to perform double digests ... especially when the 2 enzymes have very different requirements for their activities (e.g. salt concentration, temperature optimums, ...).
If a DNA restriction map is known for a particular enzyme, and if the DNA is treated with this enzyme, then one can ascertain whether the digest was complete or not. However, if a restrictioin map is just being compiled, and if the DNA is treated with 2 enzymes in a double digest, at times difficulties may arise in determining the map if either (or both) enzymes did not completely digest the DNA.
nucleolus
Is it possible to resurrect the organism (by cloning) whose DNA was sucked by the mosquito?
fossilized extinct species
Gattaca what does the turn style do to the people entering Gattaca?
It's just an id checker, only letting in the people whom are permitted.
What are 4 ways in which genetic variation is created in living systems?
1. Random mating 2. a large population 3. Individuals are able to migrate to different regions 4. An absense of mutation
Which Gender is much more prominent in the Human Genetic Disorder Phenylketonuria Male or Female?
From looking at my family tree i've found males tend to have the disorder while females tend to be carriers (only recieving one of the two necessary genes). It may or may not be a scientific fact, but it's what it looks to be to me.
Are children of Down Syndrome parents normal?
That would mean that the mother is the one with Down syndrome, since men with Down syndrome are sterile. There is a 50% chance that the child will have Down syndrome and 50% chance that child will be born without.
