Question 1

If identical sister chromatids are held together as one chromosome in a cell, what would be the ploidy number of that cell and why?

Accepted Answer

A)  The cell can be either haploid (1n) or diploid (2n) depending on the stage of the cell cycle. 
B)  Haploid (1n) because it still has the same number of homologous pairs of chromosomes. 
C)  Diploid (2n) because it still has the same number of homologous pairs of chromosomes. 
D)  Diploid (2n) because the number of chromosomal arms has increased. 
E)  Haploid (1n) because the cell is about to divide and the chromatids separate to form the genetic blueprint for each individual cell. 
A)  The cell can be either haploid (1n) or diploid (2n) depending on the stage of the cell cycle. 
B)  Haploid (1n) because it still has the same number of homologous pairs of chromosomes. 
C)  Diploid (2n) because it still has the same number of homologous pairs of chromosomes. 
D)  Diploid (2n) because the number of chromosomal arms has increased. 
E)  Haploid (1n) because the cell is about to divide and the chromatids separate to form the genetic blueprint for each individual cell.

Question 2

Two scientists are discussing mitosis in plant cells. Scientist one states that plant cells undergo cleavage in a manner similar to animal cells, whilst scientist two other argues that instead they form a cell plate. Which scientist is correct and why?

Accepted Answer

A)  Scientist one, as all eukaryotic cells undergo mitosis in an essentially identical manner. 
B)  Scientist two, as animal cells do not undergo cleavage because of their cell wall. 
C)  Scientist one, as even though there are some distinct differences in the process of mitosis in animal and plant cells, cleavage is shared by both. 
D)  Scientist two, but the context given for the cell plate is irrelevant to mitosis. 
E)  Both scientists are incorrect; plant cells divide by the action of vesicles deposited by the tonoplast. 
A)  Scientist one, as all eukaryotic cells undergo mitosis in an essentially identical manner. 
B)  Scientist two, as animal cells do not undergo cleavage because of their cell wall. 
C)  Scientist one, as even though there are some distinct differences in the process of mitosis in animal and plant cells, cleavage is shared by both. 
D)  Scientist two, but the context given for the cell plate is irrelevant to mitosis. 
E)  Both scientists are incorrect; plant cells divide by the action of vesicles deposited by the tonoplast.

Exam 8: Cell Division

If identical sister chromatids are held together as one chromosome in a cell, what would be the ploidy number of that cell and why?

Two scientists are discussing mitosis in plant cells. Scientist one states that plant cells undergo cleavage in a manner similar to animal cells, whilst scientist two other argues that instead they form a cell plate. Which scientist is correct and why?

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