Concepts of Biology

Introduction to Cell & Molecular Biology (BIOL121) - Dr. S.G. Saupe (ssaupe@csbsju.edu); Biology Department, College of St. Benedict/St. John's University, Collegeville, MN 56321

Questions: Cell Division Figures

Directions: Obtain a copy of the diagrams of mitosis and meiosis. Then answer the following questions.

Mitosis Figures: Obtain a copy of the diagrams of mitosis and then answer the following questions:

Complete the table by naming each stage shown in the diagrams and then describe what occurs during each stage.

Stage	Name of Stage	Describe briefly what is occurring during this stage
A.
B.
C.
D.
E.
F.
G.
H.

List the stages in order. The first one is done for you:
F →
Is this showing mitosis in an animal or plant cell? How do you know?
Define/describe each of the following:

chromatin

chromosome

chromatid

centrosome

centriole

spindle

microtubule

metaphase plate

cleavage furrow

nucleus

nucleolus

Meiosis Figures: Obtain a copy of the diagrams of meiosis. Then answer the following questions.

1. Assume that diagram "A" represents a sex cell in interphase before meiosis. Further assume that the diploid number of this cell is 8 (2n = 8). For each figure, indicate whether it is: (a) is haploid (n) or diploid (2n); (b) the number of chromosomes in the cell; (c) the name of the stage; (d) whether the diagram depicts meiosis I or II; and (e) a brief description of what is occuring.

Stage	Ploidy (2n or n?)	Chromosome #	Name of Stage	Meiosis I or II?	Describe briefly what is occurring during this stage
A.	2n	8
B.
C.
D.
E.
F.
G.
H.
I.

2. Define or describe the following terms/concepts:

haploid

diploid

homologous chromosome

bivalent/tetrad

synapsis

Is this a plant or animal cell? Explain.

List the stages in order. The first one is done for you:
A →

How can you tell which chromosomes come from which parent?