The T thumb allele has one specific amino acid that is different from the amino acid at that position in the recessive “t” allele. Which of the following is the most likely cause of the initial amino acid variation 1. The t allele contains a mutation that occurred during DNA replication.
2. Enzymes replaced the amino acid once the thumb muscle protein was produced.
3. An additional amino acid was mistakenly inserted into the thumb muscle protein during meiosis.
4. an error occurred during the folding of the thumb muscle protein.

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he is very short, and he can only reach halfway up on the elevator buttons. but on a rainy day, he has his umbrella with him, and he uses it to poke the button at the top.

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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