If a plant has a somatic chromosome number of 2n = 14, how many types of secondary trisomics can be developed?

✅Explanation:There are 14 types of secondary trisomics possible in this plant for the following reasons:
-Somatic chromosome number: The plant has 2n = 14 chromosomes, meaning it has 7 pairs of homologous chromosomes.
-Secondary trisomics: Secondary trisomics arise when an individual has three copies of one chromosome instead of the usual two (disomy). Each of the 7 pairs can have an extra copy, leading to 7 independent possibilities.
-No orientation effect: Unlike primary trisomics (where the extra chromosome can be present in different configurations), secondary trisomics involve an isochromosome, a chromosome with identical arms. This means there's no specific orientation to consider, and each pair contributes one possibility.
Therefore, the total number of secondary trisomics is 7 pairs * 1 possibility per pair = 14.

🔴Related Terminologies::
-Somatic chromosome number (2n): The total number of chromosomes in a somatic (body) cell of an organism.
-Disomy: The presence of two copies of a chromosome.
-Secondary trisomy: A chromosomal abnormality where an individual has three copies of one chromosome due to an isochromosome.
-Isochromosome: A chromosome with identical arms formed by longitudinal duplication.