biology and sex chromosomal sex chromosomal anomalies
TRANSCRIPT
Biology and SexChromosomal Sex
Chromosomal Anomalies
Biology and SexChromosomal Sex
Chromosomal Anomalies
KEY CONCEPTS• Chromosomal Sex
• The Basics: 46 Chromosomes, Two Sex Chromosomes, X’s And Y’s• Andosperm and Gynosperm• The Problematic X Chromosome and Sex-Linked Traits
• Chromosomal Anomalies• Errors in cell division lead to extra or missing chromosomes• Turner’s Syndrome (X Ø) Ø)• Trisomy X Syndrome (XXX)• Klinefelter’s Syndrome (XXY or even XXXY)• Supernumerary Y Syndrome (XYY)
OvumOvum SpermSperm
Each contributes 23 chromosomes for a total of 46Each contributes 23 chromosomes for a total of 46
Always an XAlways an X An X or a YAn X or a Y
OvumOvum SpermSperm
Each contributes 23 chromosomes for a total of 46Each contributes 23 chromosomes for a total of 46
Always an XAlways an X An X or a YAn X or a Y
Y-AndospermX-Gynosperm
XX - FemaleXX - Female XY - MaleXY - Male
THE PROBLEMATIC X CHROMOSOMETHE PROBLEMATIC X CHROMOSOMEPathological Sex-Linked TraitsPathological Sex-Linked Traits
Hemophilia Hemophilia • Color Blindness • Muscular Dystrophy
KEY CONCEPTS• Chromosomal Sex
• The Basics: 46 Chromosomes, Two Sex Chromosomes, X’s And Y’s• Andosperm and Gynosperm• The Problematic X Chromosome and Sex-Linked Traits
• Chromosomal Abnormalities• Errors in cell division lead to extra or missing chromosomes• Turner’s Syndrome (X Ø) Ø)• Trisomy X Syndrome (XXX)• Klinefelter’s Syndrome (XXY or even XXXY)• Supernumerary Y Syndrome (XYY)
Trisomy XTrisomy XSyndromeSyndrome
Turner’sTurner’sSyndromeSyndrome
In the absence of a “Y” chromosome, these are females.In the absence of a “Y” chromosome, these are females.