NOTES: HUMAN CHROMOSOMES & PLOIDY
Name:
Human Chromosomes - Brainstorm:
How is the DNA of humans similar to the DNA of
other species? How is it different?
How is the DNA of one individual similar to the DNA
of another? How is it different?

Karyotype = ______________________________________________________________
o Human Chromosome Number
o Autosomes
o Sex Chromosomes
 Humans, and many other species that reproduce sexually, have TWO versions of each
chromosome, one from __________ and one from ___________. These are called
_______________________________________. Each chromosome in a homologous
pair carries _____________________________________________________________.
 Because we have 2 versions of each homologous versions of each chromosome, we are
called _____________________________________. We can notate this ____________.
o Ploidy = ____________________________________________________________
o Practice: Describe & notate the ploidy for each of the following:
1) A species with 2 versions of 8 chromosomes
2) A species with 4 versions of 12 chromosomes
3) A species with 3 versions of 10 chromosomes
4) A species with 2 versions of 23 chromosomes
 When the DNA replicates, the two identical copies
form ____________ _____________________
that are held together at a centromere.
Humans Chromosomes at Each Stage of the Cell Cycle:
46 Chromosomes in a Human Cell
(2 versions of each of the 23)
46 Chromosomes AFTER Replication
(2 copies of each of the 2 versions of the 23)
DNA
REPLICATION
CELL DIVISION
INQUIRY ACTIVITY: ROSE COLORS
Name:
Predict:
Roses have 7 unique types of chromosomes. Imagine this is a
karyotype for a diploid rose, and that the gene for color is found on
chromosome #5.
If this rose inherited the “red” version of the color gene from its
mother a nd the “blue” version of the color from its fa ther, wha t color
might the rose be?
Homework: Intro to Inheritance
Name:
Please go to http://learn.genetics.utah.edu/content/basics/ to watch a few short videos
introducing traits and inheritance. (The link is also posted on google classroom.)
First, watch “What is Inheritance?”
1. Write a definition for “inheritance.”
2. True or False: You get some of your DNA from your grandparents. Explain.
3. Why are siblings different from each other, even though they have the same parents?
Then, watch “What are traits?”
4. Write a definition for traits.
5. True or False. All of your traits are determined by your DNA. Explain.