102 Human Chromosomes OBJECTIVES OF THE INVESTIGATION upon completion of inresti

Question

102 Human Chromosomes OBJECTIVES OF THE INVESTIGATION upon completion of inrestigation you sbowld be to size, centromere describe the morphology of human chromosomes with reference standard numerical position, and presence or absence of satellites. berrations using 2. describe representative structural chromosome a number of and letter symbols, and chromosomes and determine or 3. karyotype of human leukocyte or absence of a numerical chromosomes present, sex of the individual, and presence structural chromosome aberration. I. MORPHOLoGY OF CHROMosoMES human chromosomes On the basis of chromosome length and position of the mere, normal xx centrom A to G, and one pair of sex 1 to 3 4 and 5 6 to 12 13 to 15 19 and 20 21 and 22 Use Figure 10.1 to answer the following questions 1. A metacentric chromosome is one that has a centra located centromere and chromosome aly arms with approximately equal length. Which of the human chromosomes are metacentric? Answer by giving individual chromosome numbers 2. submetacentric chromosomes have centro located close to the center of the chromosome, but the chromo ome arms are distinctly unequal in length. Which human chromosomes fall into 3. Acrocentric chromosomes centromeres located much nearer one end than the other, result- ing in chromosome arms tat are decidedly u in length one of the chromosome arms will be very short). Which of the human chromosomes are acrocentric No human chromosomes have centromeres on the end (tel 4. Certain human chromosomes also have secondary thus having only one arm. of ribosomal RNA genes constrictions that u y represent the region, constriction separates a portion of the short arm from the the secondary main body of the These

Explanation / Answer

Answer 1) Human chromosome number 1, 3, 16, 19, and 20 are metacentric chromosomes.

Answer 2) Human chromosome number 2, 4-12, 17, 18 and X chromosome are submetacentric chromosomes.

Answer 3) Human chromosome number 13, 14, 15, 21, 22 and Y chromosome are acrocentric chromosomes.

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