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Answer :
Final answer:
A baby that has 'his father's nose' likely has many alleles from both parents that contribute to the shape of the nose, reflecting a polygenic inheritance pattern rather than a single-gene trait.
Explanation:
If a baby is said to have "his father's nose," this could mean that the baby has inherited a particular allele related to nose shape from the father, or, more likely, it reflects the combination of many alleles from both parents that work together to determine the shape of the baby's nose. Genetic traits such as these can be inherited in different ways, ranging from single-gene inheritance to polygenic inheritance, where multiple genes influence a trait.
For example, let’s consider a characteristic like a cleft chin which is influenced by a single gene. The allele for a cleft chin is represented as “B” and is dominant, while the allele for a smooth chin is represented as “b” and is recessive. If both parents provide a “B” allele, or one parent provides a “B” and another provides a “b”, the resulting phenotype will be a cleft chin. Conversely, if both parents provide a “b” allele, the child will have a smooth chin.
Focusing on the initial question, the most accurate answer is (e) - the baby has inherited many alleles from his father that work together to shape the baby's nose. While nose shape is influenced by genetics, it is unlikely to be determined by a single gene, as most physical traits are the result of polygenic inheritance.
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