Final Chromosome Study Lab Answers
A Chromosome Study Lab
An examination of the chromosomes of a cell under high magnification can give much information about an organism. Figure 1 shows the chromosomes of a somatic cell as they might appear in an organism if enlarged many times their natural size. A somatic cell is any cell making up the organism except for reproductive cells.
In this investigation, it is expected that you:
a. learn what a chromosome Karyotype is.
b. prepare a Karyotype of chromosomes according to the instructions provided.
c. answer questions regarding the Karyotype.
d. determine the major chromosomal differences between somatic (body) and reproductive (egg and sperm) cells.
MATERIALS: scissors, tape
PART A:S
You will receive a picture of chromosomes …show more content…
Cut out the chromosomes, being careful not to lose any. Cut around them in squares to save time, but cut them in small squares, like this.
2. Arrange the chromosomes on your table from largest to smallest.
Use the TOTAL LENGTH of the chromosomes as a guide. The chromosomes that look like “half chromosomes” are really whole chromosomes; their centromeres are just placed differently. The two unshaded chromosomes are sex chromosomes and should be placed at the end of your lineup.
3. Now, arrange the chromosomes in homologous pairs, keeping them in order (from largest to smallest).
4. Complete your karyotype by taping the chromosomes down in pairs from largest to smallest on the page provided. For example, the largest pair belongs in position #1, the next largest in position #2, etc. Use your best judgment when estimating sizes. The unshaded chromosomes belong together in the last position labeled sex chromosomes.
5. CLEAN UP all scraps of paper from your table and the floor. Answer the questions on your lab.
Name ___________________________________
Period ______
_______________________________________ …show more content…
They determine the sex of the organism. The longer of the unpaired chromosomes is called the X chromosome. The shorter chromosome is called the Y chromosome.
Some organisms, including humans, have paired sex chromosomes. This combination is referred to as XX sex chromosomes. The XX combination produces a female. The XY combination produces a male.
6. Which sex chromosomes are present in the karyotype that you prepared? _________________
7. What is the sex of this person? _________________
8. What is the sex of a human if there are 23 matched pairs of chromosomes (including the sex chromosomes) in all the somatic cells? ______________________
9. Which sex chromosomes do you (personally) have? _________________
Gametes or reproductive cells (sperm and eggs cells) have only the n or haploid chromosome number. Human egg or sperm cells have only 23 chromosomes. The haploid chromosome number or n is always one half the diploid or 2n number.
10. The diploid chromosome number for a rabbit is 44. How many chromosomes are present in each rabbit sperm cell? _________________
11. Corn has 10 chromosomes in each of its egg cells. What is the 2n number of corn?
An examination of the chromosomes of a cell under high magnification can give much information about an organism. Figure 1 shows the chromosomes of a somatic cell as they might appear in an organism if enlarged many times their natural size. A somatic cell is any cell making up the organism except for reproductive cells.
In this investigation, it is expected that you:
a. learn what a chromosome Karyotype is.
b. prepare a Karyotype of chromosomes according to the instructions provided.
c. answer questions regarding the Karyotype.
d. determine the major chromosomal differences between somatic (body) and reproductive (egg and sperm) cells.
MATERIALS: scissors, tape
PART A:S
You will receive a picture of chromosomes …show more content…
Cut out the chromosomes, being careful not to lose any. Cut around them in squares to save time, but cut them in small squares, like this.
2. Arrange the chromosomes on your table from largest to smallest.
Use the TOTAL LENGTH of the chromosomes as a guide. The chromosomes that look like “half chromosomes” are really whole chromosomes; their centromeres are just placed differently. The two unshaded chromosomes are sex chromosomes and should be placed at the end of your lineup.
3. Now, arrange the chromosomes in homologous pairs, keeping them in order (from largest to smallest).
4. Complete your karyotype by taping the chromosomes down in pairs from largest to smallest on the page provided. For example, the largest pair belongs in position #1, the next largest in position #2, etc. Use your best judgment when estimating sizes. The unshaded chromosomes belong together in the last position labeled sex chromosomes.
5. CLEAN UP all scraps of paper from your table and the floor. Answer the questions on your lab.
Name ___________________________________
Period ______
_______________________________________ …show more content…
They determine the sex of the organism. The longer of the unpaired chromosomes is called the X chromosome. The shorter chromosome is called the Y chromosome.
Some organisms, including humans, have paired sex chromosomes. This combination is referred to as XX sex chromosomes. The XX combination produces a female. The XY combination produces a male.
6. Which sex chromosomes are present in the karyotype that you prepared? _________________
7. What is the sex of this person? _________________
8. What is the sex of a human if there are 23 matched pairs of chromosomes (including the sex chromosomes) in all the somatic cells? ______________________
9. Which sex chromosomes do you (personally) have? _________________
Gametes or reproductive cells (sperm and eggs cells) have only the n or haploid chromosome number. Human egg or sperm cells have only 23 chromosomes. The haploid chromosome number or n is always one half the diploid or 2n number.
10. The diploid chromosome number for a rabbit is 44. How many chromosomes are present in each rabbit sperm cell? _________________
11. Corn has 10 chromosomes in each of its egg cells. What is the 2n number of corn?