JeffTheGoat
26.10.2020 •
Biology
Earlobes can be either attached or detached. The allele for attached earlobes
is recessive (e), and the allele for detached earlobes is dominant (E). What
must be true if a boy is born with attached earlobes?
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Ответ:
Answer/Explanation:
There are three principles of cell theory
All organisms are composed of at least one cellCells are the basic unit of organization of the structure of an organismAll cells come from from pre-existing cells.The ability of DNA to replicate links to the third principle, all cells arise from other cells.
DNA duplicates through the process of semi-conservative replication. Each strand of the double stranded DNA molecule is replicated independently, and each strand forms the part of one new strand. This means there is now 2 DNA molecules from 1.
Remember DNA contains all the information required to make an organism. So for a new cell to arise from a pre-existing cell, the DNA must replicate. Otherwise life could not continue.