Download Review Sheet for Test #1

(EUKARYOTIC) CHROMOSOME STRUCTURE:
When the cell is not dividing, DNA is long and stringy and called __________________.
When the cell is dividing, DNA is tightly coiled around _______________ and is called
_________________________.
CHROMOSOME NUMBERS:
Each species has a specific number of chromosomes in the _______________ of each of
its cells. For example, humans have ______ chromosomes in each body cell, and dogs
have _____ in each body cell. There is a tongue fern that has _________ in each body
cell!
The number of chromosomes that an organism has is NOT related to the ______________
of the organism!
In body cells, chromosomes come in _____________.
_____________________________ are the pair of chromosomes that determine the sex of
the organism. In humans, the sex chromosomes are _____ and _____. Normal females
have ___________ chromosomes, and a normal male has ____________ and __________.
All of the other chromosomes are called ______________________.
So, in humans:
____ pairs or _____ chromosomes are autosomes and
____ pair or ____ chromosomes are sex chromosomes
There are certain disorders associated with having too little or too many chromosomes:
1.
__________________________ - 3 copies of chromosome # ______
(_____________________________)
2.
__________________________ - female with only ____ chromosome (XO)
(____________________________)
3.
_______________________________ - male with ________
4.
___________________________ - 3 copies of # ______
Doctors can detect these conditions before birth:
______________________________ - removes amniotic fluid from around baby
Chromosomes are photographed and organized onto a chart called a
___________________________