Common covalent bonds include

 MgO
 KF
 CH4

CH₄

Explanation:

The four C-H bonds are covalent;

The C atom shares electrons with each of the four H atoms.

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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.