102 OBJECTIVES OF THE INVESTIGATION describe the morPholopry or absence of satel

Question

102 OBJECTIVES OF THE INVESTIGATION describe the morPholopry or absence of satellites, aberrations using standard numerical and letter symbols, and and determine nuanber of 3. prepare a karyotype of human leukocyte absence of a numerical or chromosomes present, sex of the individual, and presence or I. MORPHOLOGY OF CHROMosoMES centromere, normal human chromosomes On the basis of chromosome length and position of the chromosomes, xx or have been arranged in seven groups of A to G, and one pair of sex XY With these criteria, the 23 pairs are classified as follows: 1 to 3 4 and 5 6 to 12 13 to 15 to 18 19 and 20 XX or XY Use Figure 10.1 to answer the following questions: 1. A metacentric chromosome is one that has a centrally located and chromosome arms with approximately equal length. Which of the human chromosomes are metacentric? Answer by giving individual chromosome numbers. 2. submetacentric chromosomes have centromeres located close to the center of the chromosome, but the chromosome arms are distinctly unequal in length. Which human chromosomes fall into this category? 3. Acrocentric chromosomes have centromeres located much nearer one end than the other, result- ing in chromosome arms that are decidedly unequal 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 tric), thus having only one arm. 4. Certain human chromosomes also have secondary constrictions that usually represent the site of ribosomal RNA genes (nucleolar organizing region; NOR). Morphologically, the secondary constriction separates a portion of the short arm from the main body of the chromosome. These

Explanation / Answer

1. Metacentric chromosome number: Group A that is from chromosomes 1to 3 comes under metacentric.

2. Submetacentric chromosomes number: Group B and C that is from fourth chromosome to twelfth chromosome comes under submetacentric region.

3. Acrocentric chromosome number: Group D and G that is chromosome 13 to 15 and 21 to 22 comes under acrocentric.

Maybe the other groups of chromosome have some problems so they don't occupy any place.

4) Talking about telocentric: as humans don't have tail so telocentric does not has any chromosome.

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