Multiple choice

Autotetraploids may arise by

  1. dispermy

  2. fusion of an abnormal diploid gamete

  3. fusion of two abnormal diploid gametes

  4. triple fusion

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Autotetraploids (4x) can form when two unreduced diploid gametes (2n each) fuse during fertilization, producing a 4x zygote. This is different from chromosome doubling in somatic tissues. The fusion of two abnormal diploid gametes is one documented pathway to autotetraploidy in plants.