Answer:
A. 25%
Explanation:
According to the diagram, a free earlobe is dominant and an attached earlobe is recessive. This means that the trait of attached earlobes are only shown when they the allele ff.
Only one of the four possibilities have the allele ff, meaning the percentage is 25%.
Apurinic sites in an intact double helix DNA molecule result from the loss of a nucleotide base.
<h3>What is an apurinic site? </h3>
An apurinic/apyrimidinic/abasic site is a position in a molecule of DNA which lacks any purine or pyrimidine base. These sites are also found in RNA molecules but their frequency is more in DNA molecules.
DNA damage caused by a spontaneous depurination can result in the formation of an abasic site.
In the presence of an abasic site, DNA polymerases cannot function. Thus to maintain the integrity of the genome, these sites need to be repaired.
Two methods to repair are base excision repair and nucleotide excision repair.
Read more about DNA damage, here
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Answer:
Cyanobacteria were very simple organisms and performed were an role in changing Earth's early atmosphere. They carried out photosynthesis to produce the materials they needed to grow. In this process, they relesed Oxygen which is needed to sustain life on Earth for Humans and other organisms
Explanation:
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