Progeny of triploid tomato plants often contain parts of an extra chromosome, in addition to the normal complement of 24 chromosomes (J. W. Lesley and M. M. Lesley. 1929. Genetics 14:321–336). Mutants with a part of an extra chromosome are referred to as secondaries. James and Margaret Lesley observed that secondaries arise from triploid (3 n), trisomic (3 n + 1), and double trisomic (3 n + 1 + 1) parents, but never from diploids (2 n). Give one or more possible reasons that secondaries arise from parents that have unpaired chromosomes but not from parents that are normal diploids.
Progeny of triploid tomato plants often contain parts of an extra chromosome, in addition to the normal complement of 24 chromosomes (J. W. Lesley and M. M. Lesley. 1929. Genetics 14:321–336). Mutants with a part of an extra chromosome are referred to as secondaries. James and Margaret Lesley observed that secondaries arise from triploid (3 n), trisomic (3 n + 1), and double trisomic (3 n + 1 + 1) parents, but never from diploids (2 n). Give one or more possible reasons that secondaries arise from parents that have unpaired chromosomes but not from parents that are normal diploids.
Biology: The Dynamic Science (MindTap Course List)
4th Edition
ISBN:9781305389892
Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan
Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan
Chapter13: Genes, Chromosomes, And Human Genetics
Section13.3: Chromosomal Mutations That Affect Inheritance
Problem 1SB: What mechanisms are responsible for: (a) duplication of a chromosome segment; (b) generation of a...
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Progeny of triploid tomato plants often contain parts of an extra
chromosome, in addition to the normal complement of 24 chromosomes
(J. W. Lesley and M. M. Lesley. 1929. Genetics 14:321–336). Mutants
with a part of an extra chromosome are referred to as secondaries. James
and Margaret Lesley observed that secondaries arise from triploid (3 n),
trisomic (3 n + 1), and double trisomic (3 n + 1 + 1) parents, but never
from diploids (2 n). Give one or more possible reasons that secondaries
arise from parents that have unpaired chromosomes but not from parents
that are normal diploids.
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