Karyotype

Write neatly and legibly. Copyright reserved Please turn over Life Sciences/P1 3 NSC DBE/Feb. – Mar. 2011 SECTION A QUESTION 1 1.1 Various options are provided as possible answers to the following questions. Choose the correct answer and write only the letter (A – D) next to the question number (1.1.1 – 1.1.6) in the ANSWER BOOK, for example 1.1.7 D. 1.1.1 The process in which male gametes are formed in humans is called … A B C D 1.1.2 When the first…

would include low muscle tone, a single deep crease across the palm of the hand, a slightly flattened facial profile and an upward slant to the eyes. However, just to be sure that the bay does in fact have Down syndrome, karyotype (a chromosomal analysis) is performed. Karyotype is when doctors draw a blood sample to examine the baby’s cells. Once this is done they then photograph the…

knowing they have it. XYY syndrome is a disease that makes you very tall. XYY syndrome is a genetic condition in which a human male has an extra male (Y) chromosome, giving a total of 47 chromosomes instead of the more usual 46. This produces a 47,XYY karyotype, which occurs every 1 in 1,000 male births.en.wikipedia.org/wiki/XYY_syndrome Xyy syndrome was discovered by a man named Sandberg in 1961.This disease increases your height.Most of these cases are due to a cell-division error in the sperm…

Trisomy is a cell that has three copies of one chromosome instead of having the normal two copies. Trisomy 21 is known as the congenital disorder Down syndrome. This occurs when each cell has three copies of chromosome twenty one rather than having a pair. Commonly, Down syndrome is caused by nondisjunction. Nondisjunction is "an error in which homologous chromosomes or sister chromatids fail to separate normally during meiosis or mitosis" (Huether,McCance pp.42). Scientists have discovered…

Remember
Learning Outcome: 02.04.01 List and describe the phases of meiosis.
Section: 02.04
Topic: Meiosis
  32. The physical structure that is formed when two chromatids cross over is called a(n) _______. 
A. synaptomenal complex
B. bivalent
C. karyotype
D. chiasma 
Bloom's Level: 1. Remember
Learning Outcome: 02.04.01 List and describe the phases of meiosis.
Section: 02.04
Topic: Meiosis
 33. If an organism has five pairs of chromosomes, how many chromosomal combinations are possible…

Disability Paper RING 14 CHROMOSOME SYNDROMES 14 What is RING14 syndrome? RING 14 indicates an aberration with respect to chromosome 14, which takes the form of a ring as soon as its two extremities, the long arm and the short arm, fuse together. The fusion occurs through two ruptured events, one at the extremity of the short arm and the other at the end of the…

Wolf-Hirschhorn syndrome can also be detected through genetic testing in karyotypes, as it is a defect in Chromosome 4. Person with Wolf-Hirschhorn Syndrome They have physical deformities, and also mental disabilities. Although they can be treated, they might not get treated immediately or be over with quickly, allowing the disorder…

the hand, a flat face, and a slant to their eye placement. These features can be present in babies without Down syndrome, so doctors perform an analysis called a karyotype, where they take blood from the baby to sample its cells. They take a picture of the chromosomes and group them by size, number, and shape. By examining the karyotype, the doctors can determine Down…

With today’s technology it is much easier to test a baby’s chromosomes. After giving birth, chromosome analysis can be done via blood test, before birth via prenatal testing i.e. Amniocenteses or Chorionic villus sampling. This topic is controversial and there are mixed feelings if the testing should be done. I feel that doing prenatal testing in advance is unnecessary because generally, people do not terminate a pregnancy even when they hear that the fetus might have chromosomal abnormalities.…

order for chromosomes to be seen this way, they need to be stained. Once stained, the chromosomes look like strings with light and dark bands, and their picture can be taken. A picture, or chromosome map, of all 46 chromosomes is called a karyotype. The karyotype can help identify abnormalities in the structure or the number of chromosomes. To help identify chromosomes, the pairs have been numbered from 1 to 22, with the 23rd pair labeled "X" and "Y." In addition, the bands that appear after…