Question

Which of the pairing is not feasible?

(a) Pairing between homologous chromosomes

(b) Pairing between homologous parts of non-homologous chromosome

(c) Pairing between 4 chromosomes following translocation

(d) Pairing between more than 2 chromosomes

This question was posed to me in exam.

My doubt stems from Meiosis Prophase 1 : Zygotene in chapter Chromosomal Changes During Meiosis of Cytogenetics

Answer 1

Right choice is (d) Pairing between more than 2 chromosomes

The best I can explain: Translocation may result in the chromosome that is partially homologous to two different chromosomes, this result in pairing of 4 chromosomes. Also homologous segments in non-homologous chromosomes can par. But pairing with more than 2 chromosomes in a normal instance is not seen.