Drawings and Punnett Squares

Cell Cycle
Part A – Mitosis (16 points) – Use different colors for your chromosome pairs.
1. Neatly draw a cell at interphase with 6 chromosomes (2n = 6) – (3 pairs of chromosomes)
2. Neatly draw that same cell at each of the stages of mitosis (PMAT).  Label each stage and be
specific in these drawings with the chromosome structure and arrangement, placement of
centrioles and spindle fibers, and presence or absence of nuclear membrane.  
3. Neatly draw the two resulting cells after cytokinesis.
4. Next to or under each cell, list the main events at each stage, and state whether each cell is
diploid (2n) or haploid (n).  
Part B – Meiosis – Use different colors for your chromosome pairs.
1. (4 points) Draw the same cell above if it was at the Metaphase I stage of meiosis.  Then draw a
second cell at this same stage demonstrating a different random assortment of chromosomes
around the cell equator.  Include a crossing over event in one pair of chromosomes.  
2. (4 points) Draw the same cell at Metaphase I again, and then draw the two resulting cells at
Metaphase II of meiosis.  Indicate whether each cell is diploid (2n) or haploid (n).
Mendelian Genetics – Punnett Squares
Part C – Monohybrid Cross (4 points)
In humans, the normal pigment allele (A) is dominant over the recessive albino allele (a).  If two
individuals heterozygous (Aa) for the pigment gene mate, what are the chances they will have a child
with albinism?  Show your work with a Punnett Square. Be sure to show your gametes on top and down
the left side of the square.  
Part D – Dihybrid Crosses (8 points)
Following a DdEe x DdEe cross, what fraction of the offspring are predicted to have a genotype that is
heterozygous for both characteristics?  Show your work using a Punnett square.  Be sure to show the
gametes on top and down the left side of the Punnett square and fill in the squares with the offspring
genotypes.