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MAVERICK [17]
2 years ago
12

HELP, define genetic engineering and Describe how DNA is modified for use in genetic engineering.

Biology
1 answer:
Xelga [282]2 years ago
6 0

Answer:

Genetic engineering is deliberate modification of genome to gain desired traits.

The main steps of genetic engineering:

Restriction enzymes are used to isolate the required gene leaving it with sticky ends. Sticky ends are a short section of unpaired bases A vector, which is usually a bacterial plasmid or a virus, is cut by the same restriction enzyme leaving it with corresponding sticky ends. The vector and the isolated gene are joined together by ligase enzyme. The vector inserts the gene into required cells. The genes are transferred to animal, plant or microorganism cells, during early development, which allows them to develop with the desired characteristics.

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Which biological scenario(s) best describes phenotypic plasticity for a trait?
DIA [1.3K]

Answer:

C) II and III only

Explanation:

Option 1 is not an example of phenotypic plasticity because each person is born with their own blood type and this doesn't change based on their environment and behavior.

Option 2 is an example of phenotypic plasticity because a person's red blood cell counts can increase based on their environment, i.e. moving to Denver, CO from Death Valley, CA. The higher elevation and decreased oxygen causes your body to produce more red blood cells.

Option 3 is an example of phenotypic plasticity because one twin can be taller than another because of differing behaviors, environments, etc.

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2 years ago
During what stage does the DNA copy itself
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Answer: Tightly wound chromosomes, composed of DNA, must unwind before replication. Cell replication splits a cell into two parts, both of which become new, fully functioning cells. Before this can happen, however, cells require a full complement of DNA for each of the new daughter cells that will form as a result of the split. Because of this, DNA makes a copy of itself in a process known as replication during interphase, a stage that occurs before cells divide.

Cell Phases: Mitosis is the process by which parent cells each divide into two identical daughter cells. However, this majority of the cell's time is spent in interphase, during which it performs normal metabolic functions necessary for the organism, such as manufacturing protein. DNA occurs during the S phase of interphase, sandwiched between the G1 and G2 phases. The cell uses checkpoint signals to ensure at the end of G1 that it is big enough to replicate and at the end of G2 to determine whether or not DNA replication has succeeded. If so, the cell can undergo mitosis, at which point DNA winds up tightly for easy transport during the process.

DNA Replication: Replication begins with DNA unwinding and unzipping, its two strands coming apart. While only one side is the “correct” code, containing the actual genetic information used to build the organism’s proteins, both can be the base for a new strand of complete DNA. The enzyme DNA polymerase matches up each base with the correlating base: adenine with thymine and guanine with cytosine. When each pre-existing base has been matched to a nucleotide, which also contains the sugar and phosphate of the DNA’s backbone, the strand is complete.

7 0
3 years ago
What are some reasons an organisms carrying capacity would increase
WITCHER [35]

Answer:

A few examples could be an increase in food, an increase in shelter, a decrease in predators, or more land.

5 0
2 years ago
Which of the following is not an example of organic matter?
SIZIF [17.4K]

Answer:

Bagged Fertilizers

Explanation:

A dead animal will decompose, along w/ coffee bean shells and seaweed. Fertilizers, which are made of chemicals, can not. Another way to think about it is u can eat anything but the fertilizers :-)

7 0
3 years ago
The offspring of the cross-fertilization of YY pea plants with purple flowers
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Answer: Yy; they’re purple if there’s no codominance or incomplete dominance

Explanation:

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