Answer:
The hershey chase experiment on bacteriophages showed the genetic information is carried in <u>DNA.</u>
Explanation:
In 1952 Alfred Hershey and Martha Chase provided evidence that DNA is the genetic material. These scientists carried out an experimental work with the T2 virus, a bacteriophage that infects the Escherichia coli bacteria, which reproduces by attaching itself to the outer wall of the bacteria, injecting its DNA into it where it replicates and directs, the synthesis of phage proteins. Phage DNA is encapsulated within proteins and produces phages, which lyse or break the cell and releasing phage from the progeny. They used radioactive forms (isotopes) of phosphorus and sulfur. A radioactive isotope can be used as a marker to identify the location of a specific molecule, because any molecule that contains the isotope is radioactive and therefore easy to detect. The DNA contains phosphorus, but doesn't contain sulfur, therefore phosphorus-32 was used to mark the DNA, instead the protein has sulfur, but not phosphorus, so sulfur-35 was used. Hershey and Chase found that sulfur-35 is outside the cell while phosphorus-32 was inside, indicating that DNA was the physical support of the inheritance. This work allowed the scientists to conclude that it's the DNA and not the protein that enters the bacteria during phage reproduction and that only the DNA is transmitted to the phage of the progeny.
The probability that at some point in the future allele k will drift to a frequency of 1.0 is 0.5 because genetic drift is a random and non-directional mechanism of evolution that significantly alters the gene or allele frequency in any population.
<h3>What is Genetic Drift?</h3>
Genetic drift may be defined as a mechanism of evolution in which allele frequencies of a population changes over generations due to chance (sampling error). It is more effective in small populations.
The outcome of genetic drift can not be predicted because it is a random and non-directional mechanism of evolution. It is possible that it fixes the allele k and makes its frequency 1.0, while it also alters the frequency of other alleles and makes the allele k eliminated from the given population. It is a process that depends on the phenomena of chance.
Therefore, it is well described above.
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Answer:
The founder effect
Explanation:
The founder effect is a special case of genetic drift, occurring when a small group in a population splinters off from the original population and forms a new one. The accumulation of modifications, that generally are caused by mutations, and the persistence of those changes through heredity mechanisms could make the ingredients of a new species.
Answer:
nucleus
Explanation:
The nucleus contains the cell 's DNA and directs the synthesis of ribosomes and proteins.
<span>There are five environmental factors are used to create an attractive environment is,
competitors, threat of entry, substitutes, suppliers, customers.
These are the main factors that help to determine how attractive or unattractive an environment.</span>