In human gene therapy, a genetically modified virus (a.k.a. a viral vector) can alter the genetic variation of a cell, but not all viral vectors do.
The process often begins with the delivery of or creation of a segment of viral double stranded DNA (containing the gene you want to introduce). Then typically an enzyme known as an integrase cuts the ends of the segment of viral DNA and also cuts open the cell's DNA. Then the viral DNA is integrated/ inserted into the cell's DNA. The connecting ends are ligated together and adjusted so that the nucleotide base pairs match up.
This in the future may affect the gene pool for instance if the viral DNA (your gene) was inserted in the middle of another gene or important regulatory sequence of the cell DNA, and this alteration may be passed on into offspring and become present in the gene pool, which could have bad effects.
The effects on the gene pool really depends on what the virus ends up doing. For example, it may fix the function of a damaged gene which is the goal, and allow for a working gene to be in the gene pool, which would be good. The problem with gene therapy is that it's difficult to predict 100% what the virus will do every time it is given to a patient.
But it's very important to consider that it will only affect the gene pool if the virus is able to enter and alter germ cells (reproductive cells). If the virus, enters somatic cells (regular body cells) this will not be passed on to future generations. So viruses can be designed to avoid germ cells and avoid this gene pool issue. Also, some viral vectors use viruses that do not integrate their DNA, the cells just express the viral DNA (create the desired protein from it) and over time the viral DNA is degraded/ lost which wouldn't pose this threat.
This is long, but I hope it helped!
A former meadow is turned into a housing complex, and the next year, fewer milkweed blooms are seen due to pollination.
What applications does milkweed have?
The herb has also been used medicinally despite the danger of poisoning. Many native cultures chewed the roots of milkweed to heal diarrhea and used the sap to remove warts. Infusions and salves were also made from it to treat asthma, coughing, fevers, rashes, and swelling.
What kind of soil is ideal for milkweed growth?
In regions with more rainfall, like the eastern United States, milkweed thrives. Asclepias tuberosa, sometimes known as butterfly weed, thrives in drier climates like those in the western United States. Sand or gravelly soils are required. The Clay variety is an anomaly since it thrives on heavier soils, especially dry clay. Plant under the intense sun.
Learn more about milkweed here:
brainly.com/question/28042364
#SPJ4
An independent variable is a variable which change is not affected by that of another variable. By process of elimination you can take out B and C. An independent variable can also change so that takes out A. That leaves D.
Answer:
If you place an animal or a plant cell in a hypertonic solution, the cell shrinks, because it loses water ( water moves from a higher concentration inside the cell to a lower concentration outside ). A single animal cell ( like a red blood cell) placed in a hypotonic solution will fill up with water and then burst.
Answer:
Hi, there your answer is D.Crossing Over
Hope This Helps
PLZ CORRECT ME IF I AM WRONG :)
Explanation:
