Question

True or False questions

1. It is fortunate that more people are not infected with cellular diseases because a cell cycle has only one checkpoint to stop abnormal cells from dividing.

2. Cancer cells divide more frequently than non-cancerous cells which explains why radiation and chemotherapy are effective cancer cell treatments.

3. Sister chromatids separate during meiosis II which results in cells with half the number of chromosomes as the parent cell.

4. It is fortunate that more people are not infected with cellular diseases because a cell cycle has only one check point to stop abnormal cells from dividing.

5.Karyotypes provide a photographic view of a cell's chromosomes.

6.Human gametes are haploid with one set of chromosomes and diploid cells have three sets of chromosomes.

7.If the genes for blue eyes and fair skin are linked it would be more likely that an individual would have brown eyes and fair skin than blue eyes and fair skin.

8.Many genes in the human population have more than one allele and freckles is an example of this phenomenon.

Answer 1

1. False. As cell has multiple checkpoints in a cell cycle to check the correct formation of sister chromatids and to avoid any abnormalities in cell division leading to cellular disease. So, It is fortunate that more people are not infected with cellular diseases because a cell cycle has only one checkpoint to stop abnormal cells from dividing is false. The cell has three checkpoints namely, at the G1 phase the correct base pairing of DNA is checked, at the G2 phase duplication of the chromosome is determined, At the M phase, spindle fibers are checked for their correct attachment to the kinetochore.

2. True. As cancer cells divide more frequently than normal cells, it is much more effective to be killed by chemotherapy and radiotherapy. As the radiations are much more targeted they can identify the signals of normal cells and abnormal cells so cancerous cells are killed by chemotherapy or by radiotherapy very effectively.

3. True. Sister chromatids separate during meiosis II which results in cells with half the number of chromosomes as the parent cell. and it produces 4 daughter cells.

4. False. As cell has multiple checkpoints in a cell cycle to check the correct formation of sister chromatids and to avoid any abnormalities in cell division leading to cellular disease. So, It is fortunate that more people are not infected with cellular diseases because a cell cycle has only one checkpoint to stop abnormal cells from dividing is false. The cell has three checkpoints namely, at the G1 phase the correct base pairing of DNA is checked, at the G2 phase duplication of a chromosome is determined, At the M phase, spindle fibers are checked for their correct attachment to the kinetochore.

5. True. Karyotypes are used to develop photographs of individual cell chromosomes and examine any abnormalities in the formation of chromosomes.

6. False. Human gametes are haploid with one set of chromosomes and diploid cells have three sets of chromosomes. As diploid cells consist of two sets of chromosome one from mother and one from father so total is 46. so This statement is false.

7. False. As it generally depends on the crossing over of the genes if blue and fair skin marries the person with blue eyes and fair skin it is more likely that the kids have blue eyes and fair skin. And if he marries a person with brown eyes and dark skin and mix ratio of blue and fair skin and brown and dark skin will be produced. It generally depends on the dominant gene expression.

8. True. Many genes in the human population have more than one allele and freckles are an example of this phenomenon. Similarly blood groups A and B both are dominant and a person with Blood Group AB is an example of having more than one allele.