Final answer:
Linked traits are inherited together primarily because they are located on the same chromosome. This proximity means that they tend to be passed on together during meiosis. While crossing over can separate them, it is not the main reason for their collective inheritance.
Explanation:
Why Are Linked Traits Often Inherited Together?
Linked traits are often inherited together because they are located on the same chromosome. This genetic principle is a fundamental aspect of inheritance as demonstrated by the work of early geneticists, including Thomas Morgan, who studied fruit flies to understand the connection between genes.
To elaborate:
- Located on the Same Chromosome: Genes that are on the same chromosome tend to be inherited together more frequently than those that are on different chromosomes. This is due to their physical proximity making them likely to pass together during meiosis, the process of cell division that produces gametes.
- Crossing Over Effects: Although crossing over (the exchange of chromosome segments between homologous chromosomes during meiosis) can separate linked genes, the closer two genes are to each other, the less likely they are to be separated by this process. However, the most straightforward reason linked traits are inherited together is simply their location.
- Example: If a gene for flower color and a gene for plant height are located on the same chromosome, these traits will generally be inherited together unless crossing over occurs.
Thus, the correct answer to the question is: B: They are located on the same chromosome.
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