They are made of only carbon, hydrogyn, and oxygen
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<span>A lack of proteins controlling the cell cycle can cause
cancer. </span>
Crossing over happens in prophase I when the homologous chromosomes are sy naps ed. The two inner chromoatids exchanges sections with each other. This means that after the exchange the inner two chromatids have new combinations of alleles than their parents had. The two outer chromatids still have the parental combinations.So there are more kinds of chromatids ready to go into the gametes than there were before. This is an increase in variation.
0-4 degrees Celsius, below which bacteria grow very slowly. This is the same as refrigerator temperature.
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