In the context of FISH, what is the primary purpose of 'chromosome painting' probes?

Consider the following statements regarding GISH (Genomic In Situ Hybridization):

1. GISH uses total genomic DNA from two parental species as probes.
2. GISH is commonly used to differentiate between parental genomes in interspecific hybrids.
3. Blocking DNA is often used in GISH to suppress hybridization of repetitive sequences common to both genomes.

How many of the above statements are correct?

Which type of FISH probe is most suitable for detecting microdeletion syndromes like Prader-Willi or Angelman syndrome?

What is the primary role of formamide in the FISH hybridization buffer?

Match the following FISH probe types with their common applications:

Probe Type	Application
1. Centromeric Probe	P. Detection of chromosomal translocations
2. Telomeric Probe	Q. Aneuploidy screening (e.g., Trisomy 21)
3. Whole Chromosome Paint	R. Identification of cryptic subtelomeric rearrangements

A key difference between FISH and standard cytogenetics (e.g., G-banding) is that FISH:

Which of the following is NOT a common fluorochrome used in FISH applications?

In a typical FISH experiment, what is the purpose of denaturing both the probe and the target chromosomal DNA?

A researcher is studying an allopolyploid plant species and wants to identify which chromosomes originated from each of its two parental species. Which molecular cytogenetic technique would be most appropriate?

Which of the following scenarios would most likely require the use of an interphase FISH analysis rather than metaphase FISH?

What is the function of DAPI (4',6-diamidino-2-phenylindole) in a typical FISH experiment?

A patient is suspected of having a Philadelphia chromosome (t(9;22)). Which FISH probe strategy would be most effective for confirming this translocation?

Which of the following factors does NOT directly influence the stringency of FISH hybridization?

In the context of GISH, what is the primary role of 'blocking DNA' (e.g., unlabeled genomic DNA from one parent)?

Which of the following statements best describes the principle of Multicolor FISH (M-FISH)?

A limitation of FISH is its inability to detect:

What kind of microscope is essential for visualizing the results of a FISH experiment?

Consider the following applications of molecular cytogenetics:

1. Diagnosis of specific genetic syndromes caused by chromosomal deletions.
2. Identification of species-specific chromosomes in interspecific hybrids.
3. Detection of gene amplification in cancer cells.
4. High-resolution mapping of novel genes to specific chromosome bands.

Which of these applications are directly achievable using FISH or GISH techniques?

Which step in a FISH protocol immediately follows the denaturation of chromosomal DNA and probes?

What is the primary advantage of using a 'directly labeled' FISH probe compared to an 'indirectly labeled' probe?

In the context of plant cytogenetics, GISH is particularly useful for:

Which statement accurately describes the main difference in probe preparation for FISH versus GISH?

A patient with suspected chronic myeloid leukemia (CML) shows a normal karyotype by conventional G-banding. Which FISH technique would be most appropriate to confirm or rule out the Philadelphia chromosome (t(9;22)) at a submicroscopic level?

The process of 'post-hybridization washing' in FISH is critical for: