You know the meaning of the wo

You know the meaning of the word “diploid.” Bananas aretriploid. What do you suppose that means? Wheat is a hexaploid.What does that mean?Triploid bananas are sterile — they reproduce only asexually. Whatproblems do you suppose a triploid has in meiosis that mightexplain this? NOTE: Yes, I know it’s easy to discover that nucleimust have an even number of chromosome sets to do meiosis. Thequestion here is why?


Diploid means the cells have 2n number of chromosome, forexamples in human 23 pairs of 2n chromosomes which means 2(23)= 46numbers of chromosomes. Banana has triploid, 3n numbers ofchromosomes hence for examples it has 11 triploid number ofchromosome (11 (3) = 33). Similarly, Hexaploid means 6n number ofchromosomes in organism.

   In general process of meiosis, diploid cellproduces two haploid daughter cells. However in banana meiosis isnot possible because the plant is triploid. Pairing of chromosomesoccurred only between two homologous chromosomes to form abivalent. Bivalent formation in metaphase of meiosis is animportant step for production of haploid germ cells. However intriploid the chromosomes are not equally disturbed, one becomebivalent and other become univalent or trivalent. Hence at thestage of the anaphase uneven numbers of chromosomes are distributedin each daughter cells (some are haploid and some are diploidsetc). Additionally, one extra chromosomes has deleterious effect oncell division, as one extra chromosome contains extra copy of genewhich altered the gene expression and affect the process of celldivision at meiosis. So banana triploid plants remain sterile andreproduced only asexually.

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