Progeny of triploid tomato plants often contain parts of an extra chromosome, in addition to the normal complement of 24 chromosomes. Mutants with a part of an extra chromosome are referred to as secondaries. James and Margaret Lesley observed that secondaries arise from triploid (3n), trisomic (3n 1), and double trisomic (3n 1 1) parents, but never from diploids (2n). (J. W. Lesley and M. M. Lesley. 1929. Genetics 14:321–336). Triploid and trisomic plants are vulnerable to infection by the tomato mosaic O virus, so they acquire extra chromosomal material by the integration of viral DNA, whereas diploid plants are not infected by the virus. The trivalent chromosomes would still be able to associate through c prior to segregation during meiosis. asma Triploid and trisomic conditions in tomato plants are unnatural, and this genomic imbalance leads to higher levels of mitotic recombination. Due to some unknown mechanism, triploid and trisomic tomato plants O occasionally over-replicate part of a chromosome, which leads to the generation of mutant tomato plants. Solution The second option is correct. The secondary chromosomes are mainly due to abnormalities in Anaphase segregatio, Which is popularly called Non Disjunction. So answer is \"THE TRIVIAL CHROMOSOMES WOULD STILL BE ABLE TO ASSOCIATES THROUGH CHIASMA PRIOR TO SEGREGATION DURING MEIOSIS.

1. Progeny of triploid tomato plants often contain parts of an extra chromosome, in addition to the
normal complement of 24 chromosomes. Mutants with a part of an extra chromosome are
referred to as secondaries. James and Margaret Lesley observed that secondaries arise from
triploid (3n), trisomic (3n 1), and double trisomic (3n 1 1) parents, but never from diploids (2n).
(J. W. Lesley and M. M. Lesley. 1929. Genetics 14:321–336). Triploid and trisomic plants are
vulnerable to infection by the tomato mosaic O virus, so they acquire extra chromosomal
material by the integration of viral DNA, whereas diploid plants are not infected by the virus.
The trivalent chromosomes would still be able to associate through c prior to segregation during
meiosis. asma Triploid and trisomic conditions in tomato plants are unnatural, and this genomic
imbalance leads to higher levels of mitotic recombination. Due to some unknown mechanism,
triploid and trisomic tomato plants O occasionally over-replicate part of a chromosome, which
leads to the generation of mutant tomato plants.
Solution
The second option is correct. The secondary chromosomes are mainly due to abnormalities in
Anaphase segregatio, Which is popularly called Non Disjunction. So answer is "THE TRIVIAL
CHROMOSOMES WOULD STILL BE ABLE TO ASSOCIATES THROUGH CHIASMA
PRIOR TO SEGREGATION DURING MEIOSIS