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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
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 problems- Aggressive tendency???- Fertile
Amniocentesis
Usually performed during 2nd trimester (week 14-17)
Small amount amniotic fluid is tested for chromosomal abnormalities