Final answer:
In garden peas with a diploid number of 14, trisomy refers to a condition with one extra chromosome per pair. Since there are 7 pairs of chromosomes, there can be 7 different trisomics corresponding to each of the 7 chromosome pairs.
Step-by-step explanation:
The question poses a scenario involving garden peas that have a diploid chromosome number (2n) of 14. To understand the number of different trisomics that could be formed, we should first clarify what trisomy is. Trisomy refers to a chromosomal condition where an organism has an extra chromosome in addition to the normal diploid number, making it 2n+1. In the case of the garden pea, with a diploid number of 14, each chromosome has the potential to have an extra copy. Since there are 7 pairs of chromosomes, an extra copy of any one of those pairs can lead to trisomy.
In this instance, for each pair of chromosomes, there is a possibility of having an extra chromosome. Consequently, the number of different trisomics that could be formed is equal to the number of chromosome pairs. Thus, in garden peas with 7 pairs of chromosomes, there could be 7 different trisomics. Therefore, the answer is (a) 7.