Question

Which of the following chromosomes CANNOT be discerned by light microscopy?

A) Chromosome 1
B) Chromosome 21
C) Y Chromosome
D) Mitochondrial DNA

Answer 1

The Y chromosome cannot be discerned by light microscopy.

Step-by-step explanation:

The Y chromosome is the chromosome that cannot be discerned by light microscopy. While chromosomes 1, 21, and mitochondrial DNA can be observed by light microscopy, the Y chromosome is much smaller and cannot be visualized without the use of special techniques such as fluorescence in situ hybridization (FISH) or karyotyping.