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Lecture

key terms 6.pdf

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Department
Biology
Course
BI226
Professor
Bruce Mc Kay
Semester
Fall

Description
BI226 2009 Section 6: Alterations in chromosome number and structure KEY CONCEPTS • Alterations in chromosome number and structure influe nce phenotypic expression of traits and speciation. • Aneuploidy is an aberration in which ch romosomes are missing or added so that chromosome sets are unbalanced. • Polyploidy, in which there are three or mo re sets of chromosomes in a cell, is common in plants and is important in plan t evolution, but is rare in animals. • Alterations in chromosome structure include deletions, duplications, inversions, translocations, fissions, and fusions. These alterations have important genetic consequences. • Most chromosome alterations in humans do not permit survival of the fetus. Those chromosome alterations that pe rmit survival usually have medical syndromes associated with them. KEY TERMS ploidy euploidy balanced aneuploidy unbalanced trisomy
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