Lecture 5 - Jan 25, 2010

Lecture 5 - Jan 25, 2010 - Meiotic errors and sex...

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Unformatted text preview: Meiotic errors and sex chromosomes X X X X Sperm with X chromosome X X X X X X X X X X Sperm with Y chromosome Y Y Y Y Fertilization by normal sperm X X Normal Egg Metaphase I X X X X Non-viable O O Sex determination XO Turners Syndrome XXY Klinefelters Syndrome CLICKER QUESTION hat is the TOTAL number of chromosomes present in a person with Klinefelter Syndrome? 4 5 6 Sex Determination Men with XX genotype (small portion of Y present) Women with XY (small portion of Y absent) Y chromosome: SRY gene Testes X chromosome: DAX1 inhibited by SRY Sex Linked Inheritance Hemizygous Males are hemizygous Sex-linked inheritance in Drosophila X-linked recessive phenotypes: Appear often in males heterozygous females are carriers Can skip a generation if passed from a male to his daughter Sex-linked inheritance in Drosophila Figure 10.24 Red-Green Color Blindness Is a Sex-Linked Trait in Humans Inheritance of cytoplasmic genes DNA outside the nucleus?...
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This note was uploaded on 03/18/2010 for the course BIOSC Bio 210 taught by Professor Deshmukh during the Spring '10 term at Pittsburgh.

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Lecture 5 - Jan 25, 2010 - Meiotic errors and sex...

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