Answer:
<h2> 1, 4, and 5</h2><h2>1. horizontal gene transfer,4. transformation and 5. genetic recombination.</h2>
Explanation:
In Fred Griffith's experiments, harmless R (rough) strain pneumococcus became lethal S (smooth) strain pneumococcus as the result gene transfer from smooth to rough strain. Gene transfer is the process through which genes are transferred from one cell or organism to other, and after transfer, genetic recombination occurs. Griffith's this process is called as transformation.
Answer/Explanation:
DNA is replicated through semi-conservative replication. This produces two copies of a double stranded DNA molecule, each possessing one copy of the original molecule. This occurs prior to the cell dividing, in the synthesis stage of the cell cycle.
Enzymes use the original DNA molecule as a template to produce a new strand of DNA. This occurs through the progressive addition of nucleotides, which are added as complementary base pairs matching the template strand. This means the new strand is <em>complementary </em>to the template strand. This processes is generally free of errors, but errors can be introduced during replication, causing mutations in the DNA.
Answer:
DNA mutation causes genetic variation by altering the genes of individuals in a population. Gene flow leads to genetic variation as new individuals with different gene combinations migrate into a population.
The flow of individuals in and out of a population introduces new alleles and increases genetic variation within that population. Mutations are changes to an organism’s DNA that create diversity within a population by introducing new alleles.
Polaris (aka the North Star) has a radius of around 22 million miles, which is about 50 times the size of our sun!
