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Selectively permeable means that cells only allow certain molecules to enter or exit a cell.
Answer:
DNA polymerase is an enzyme that synthesizes DNA molecules from deoxyribonucleotides, the building blocks of DNA. These enzymes are essential for DNA replication and usually work in pairs to create two identical DNA strands from a single original DNA molecule.
Explanation:
The Muller's ratchet in evolutionary genetics refers to a procedure by which gathering of harmful mutations takes place in an irreversible way by the genomes of an asexual population. Muller suggested this process as one of the cause that why sexual reproduction can be considered over to asexual reproduction.
The main influence of Muller's ratchet is the gathering of somewhat deleterious mutations. Such gathering of mutation can at certain occasions result in eventual extinction.
This takes place if population size is finite, recombination is absent, slightly deleterious rates of mutations are high, almost no back mutations takes place, and purifying selection is very weak to eradicate all the novel deleterious mutations.
The universal genetic code has a some kind of relationship to the hypotheses believed by many people as to the origin of life on the Earth. It is believed that both shared the life on Earth just like how a cell passes genetic information from one microsphere to another.