Question

Species I has 2n = 8. Species II has 2n = 12. How many chromosomes will be found in a trisomic individual from one of these species?

A)9
B)7
C)12
D)8
E)24

Answer 1

A trisomic individual of Species I with 2n = 8 would have 9 chromosomes, whereas one from Species II with 2n = 12 is not represented in the given options.

Step-by-step explanation:

The question concerns the number of chromosomes found in a trisomic individual from two different species with different diploid numbers. A trisomic individual has an extra chromosome in addition to the normal diploid set. For Species I with a diploid number (2n) of 8, a trisomic individual would have 2n + 1, which equals 9 chromosomes. Similarly, for Species II with a diploid number (2n) of 12, a trisomic individual would have 2n + 1, which equals 13 chromosomes. Therefore, without specifying which species the trisomic individual comes from, we cannot select a correct answer from the given options. However, if it's from Species I, the correct answer is A) 9 chromosomes.