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2:1

Explanation:

Let the allele for achondroplasia be represented by A.

Since the disease is lethal in AA condition, the two people would rather be Aa.

                         Aa     x     Aa

offspring       AA     Aa     Aa     aa

The AA offspring does not survive, hence, we are left with 3 children out of which 2 are affected heterozygotes and the remaining 1 is a true-breeding recessive and normal.

The expected ratio of affected to normal offspring is, therefore, 2 to 1.

the atomic number of magnesium is 12. its nucleus must contain 12 protons and no electrons. the atomic number of an atom is determined by the number of protons.

magnesium is an electrolyte injection commonly used to treat low magnesium levels in your blood. it is also used to prevent or control seizures in women with preeclampsia or eclampsia.