Lecture 10

Lecture 10 - Lecture 10 There is a mechanism that allows...

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Lecture 10 There is a mechanism that allows for tolerance of variations in sex chromosomes, chromosome 23, and 21 A reaction between genes and the environment affect the phenotype Female sex chromosome abnormalities o XO (monosomic) Turner syndrome o XX (disomic) Normal o XXX Superfemale (mental problems) Male sex chromosome abnormalities o XY (disomic) Normal o XYY (trisomic) Normal o XXY Klinefelter’s syndrome o XXYY Klinefelter’s syndrome Nondisjunction – chromosomes fail to separate properly, which can result in the above types of aneuploidy o Down syndrome – trisomy 21 o Turner syndrome Karoytype of a friend who they though had Turner’s but she didn’t. Turner’s tends to cause decreased mental capacity and low fertility, but friend had phd and many kids. But she was short, and had a wide neck. So they tested cells in other parts of her body and they came up positive for Turners. This issue arose in mitosis – separate chromatids moved in the same direction instead of the opposite direction, this is called a somatic mutation. She is a mosaic individual – she has one genetic make up in some cells and a different make up in others An Rh Negative one means that her blood type is recessive, her baby is Rh positive, which means the father had to be Rh positive. Mother’s and baby’s blood do not mix if the placenta stays healthy. When the placenta delivers is
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Lecture 10 - Lecture 10 There is a mechanism that allows...

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