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Karyotyping Biology Miss Schwipperty
Questions How many chromosomes come from your Father? How many chromosomes come from your Mother? What are chromosome pairs 1-22 called? What is chromosome pair 23 called?
Karyotype A photograph of an organism’s chromosomes -homologous chromosomes are grouped together Based on size, banding pattern, and location of centromere
Karyotype Helpful in finding chromosomal abnormalities Can NOT tell if baby has blue eyes! Are there too many or too few chromosomes? Are chromosomes missing sections?
Karyotype Changes in chromosome number occur during NONDISJUNCTION Chromosome pairs fail to separate during meiosis
Monosomy Fertilized zygote has only ONE copy of a particular chromosome
Trisomy Fertilized zygote has THREE copies of a particular chromosome
Monosomy and trisomy are often fatal to the embryo, but not always …
Trisomy 21: Downs Syndrome
Nondisjunction of the sex chromosomes …
Klinefelter’s Syndrome XXY = male; unusually small testes, sterile. Breast enlargement and other feminine body characteristics. Normal intelligence.
Jacobs Syndrome XYY = male - Tall with heavy acne - Speech & reading XYY = male - Tall with heavy acne - Speech & reading problems problems - Aggressive tendency??? - Fertile
Triple X Syndrome - XXX = female - Fertile with normal intelligence
Turner Syndrome the ONLY viable monosomy Do NOT undergo puberty XO = female ; sterile
Amniocentesis Usually performed during 2 nd trimester (week 14-17) Small amount amniotic fluid is tested for chromosomal abnormalities
Can you name to following disorders?
Karyotypes A karyotype is a map of an individual’s chromosomes. Karyotypes are normally used if a chromosomal genetic disorder is suspected in an individual.
February 23, 2009 Objective: Discuss the effects of nondisjunction
14.2 Human Genetic Disorders
When Meiosis goes wrong…
Karyotypes resulting in birth defects
Notes: Karyotypes s.
17.4 Abnormal Meiosis.
Autosomal and Sex chromosome abnormalities
Chromosomes & Human Heredity
11.3 CHROMOSOMES & HUMAN HEREDITY
Karyotypes. I. What is a Karyotype? Karyotype = a test to identify and evaluate the size, shape, and number of chromosomes in a sample of body cells.
Cell Division Meiosis Cell Division Meiosis Abnormal Meiosis.
AP Biology Errors of Meiosis Chromosomal Abnormalities.
Xy = XX= female male Female karyotype Male karyotype.
1 Chapter 11 Complex Inheritance and Human Heredity 11.3 Chromosomes and Human Heredity.
BIOLOGY 12 CHROMOSOMAL MUTATIONS referenced Horton High E-Biology.
Human Karyotypes Human Karyotypes. Normal Female: 46, XX.
1copyright cmassengale. Aorganized picture arranged in pairs by size An organized picture of the chromosomes of a human arranged in pairs by size from.
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