5. Observe the relative length and centromere location of the chromosomes shown

Question

5. Observe the relative length and centromere location of the chromosomes shown in Figure 10.1 Next, draw brackets around and assign the ppropriate letter to each of the eight groups Note that in terms of size and centromere position, the X chromosome is similar to the chromosomes in the C group of autosomes and the chromosome is similar to the G autosomes. identifying All man chromosomes have two arms, one on either side of the centromere. For arms of chromosomes with respect to the centromere, p and q are used to designate the short p and the long (q arms, respectively. C6 Figure 101 as a guide, locate the centromere region of each chromosome and then label in Figure 102, chromosomes, 6)Using place brackets around each arm (centromere to each end of all each arm with either p or q

Explanation / Answer

Answer:

5. The rule of karyotyping arranges 22 autosomes following the size and sex chromosomes, X and Y, at the end. Chromosomes are classified into seven groups, A to G, by the length and centromere position.

Group A: Chromosomes 1, 2, 3

Group B: Chromosomes 4, 5

Group C: Chromosomes 6, 7, 8, 9, 10, 11, 12

Group D: Chromosomes 13, 14, 15

Group E: Chromosomes 16, 17, 18

Group F: Chromosomes 19, 20

Group G: Chromosomes 21, 22

Sex chromosomes: X, Y

6. Chromosomes 1 to 12: the constricted region/bent region is the centromere.

Chromosomes 13, 14, 15: the centromeres are located terminally at the top of the chromosomes. (Difficult to visualize in chromosome 15)

Chromosomes 16, 17, 18: the constriction is the centromeric region. (Difficult to visualize in 2nd chromosome of 16 and 1st chromosome of 17)

Chromosome 19: the top portion above the stained black band is the centromere. (Here, the p-arm is not visible)

Chromosome 20: the constriction is the location of the centromere.

Chromosome 21 and 22: the location of the centromere should be at the top of the stained black bands as evident from the comparisons with Figure 10.1. (Difficult to visualize in the figure)

Sex chromosomes: the centromere is located at the constriction/bent region. (Note that both are X chromosomes as it is from a female with normal 46,XX karyotype)

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