What phase occurs directly after g1

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S phase

The phase that occurs directly after G1 is S phase, or synthesis phase. During this phase the cell replicates its DNA.

Explanation:

covalent bonding is a form of chemical bonding between two non metallic atoms which is characterized by the sharing of pairs of electrons between atoms and other covalent bonds.

c) 50% there are four chromosomes. after crossing over, 2 of the four have been changed. that means any gamete has a 2 in 4 chance or 50% chance of receiving the mutated chromosome.