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Department
Biology
Course
BIOLOGY 1A03
Professor
Lovaye Kajiura
Semester
Fall

Description
Biology 1A03 10/15/2012 6:33:00 AM The Changing Environment Hypothesis  A population comprised of genetically diverse individuals, will be more likely to survive and successfully reproduce than a population, which is composed of genetically identical individuals Errors can Occur during Meiosis How do mistakes occur in meiosis?  Process called non-disjunction o Gametes: some have extra chromosomes while others are missing chromosomes o Aka aneuploidy o Can happen during meiosis I or II  Meiosis I: homologous pairs don’t’ separate properly  Meiosis II: sister chromatids don’t separate properly  No crossing over in figure in textbook  Other mistakes involve chromosome structure alterations: o Look at banding patterns  genetic disorders o Deletions o Duplications (of sex chromosomes eg Klinefelter’s) o Also, crossing over errors may occur What is Aneuploidy?  Abnormal number of certain chromosomes  Individuals have too many or too few of specific chromosomes Disjunctional Segregation  things are happening fine… Examples of Trisomy of Autosomal Chromosomes in Humans  Down Syndrome
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