Respuesta :
Answer: 2 arms which is A is a dominate gene
Explanation: In genetics, the principle of dominance governs the expression of traits. When it comes to arms, the presence of the gene for two arms (let's call it "A") is dominant over the gene for four arms (let's call it "a"). This means that even if an individual carries both the gene for two arms and the gene for four arms (Aa), the dominant gene for two arms will mask the expression of the recessive gene for four arms.
So, in the case of an Aa baby, it will only express the phenotype (physical trait) corresponding to the dominant gene, which is two arms. The presence of the recessive gene for four arms doesn't manifest physically because the dominant gene for two arms suppresses its expression. Therefore, the Aa baby will have two arms like any other individual with the dominant gene for two arms (AA).
