F body is: (A) Y chromatin, (B) X chromatin, (C) Chromosome 1, (D) Chromosome 21
Answer is A. Ans. (a) Y chromatin(Ref: Emery Genetics)Quinacrine, a fluorescence dye, binds strongly to the Y chromosome forming a bright fluorescent spot (F body). This is clearly visible in stained interphase cells from various tissues from the human male and in mature spermatozoa