23. If both translocated arms in single translocation heterozygote moves to one pole, then segregation is called
(1) Alternate      (2) Adjacent
(3) Linear         (4) Uniform

Explanation of options:

• (1) Alternate – correct

  • In a reciprocal translocation heterozygote, four chromosomes form a cruciform quadrivalent.

  • In alternate segregation, the two translocated chromosomes go to one pole and the two normal homologs go to the opposite pole.

  • Each gamete gets either both normal or both translocated chromosomes, so gene balance is maintained.

• (2) Adjacent

  • In adjacent segregation (adjacent‑1 or adjacent‑2), a normal chromosome and a translocated chromosome go together to each pole.

  • This gives gametes with duplications and deletions (unbalanced), not “both translocated arms to one pole.”

• (3) Linear

  • “Linear” is not a standard name for segregation pattern in reciprocal translocation; segregation types are usually alternate, adjacent‑1, adjacent‑2, or 3:1, etc.

• (4) Uniform

  • Also not a standard cytogenetic term for these segregation patterns.

Therefore, when both translocated arms (i.e., both translocation chromosomes) move to one pole, the segregation pattern is called alternate segregation.