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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.

many phylogenetic trees have a single lineage at the base representing a common ancestor. a lineage that evolved early from the root and remains unbranched is called basal taxon. when two lineages stem from the same branch point, they are called sister taxa.

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explanation:

thats not even an aswer choice