Chromosome Worksheet
Follow along as we read the background paragraph together.
Replicated by Meiosis
Sexual Reproduction
Gametes:
Sperm & Egg Cells
Replicated by Mitosis
Asexual Reproduction
Somatic Cells:
All Other Cells
Haploid: (n)
Half the # of chromosomes
Diploid: (2n)
Chromosomes in pairs
Sperm
(n)
In humans:
Sperm
n = 23
Egg
(n)
Embryo
(2n)
Egg
n = 23
Embryo
2n = 46
Chromosome Worksheet
Species
# of Chromosomes
in Diploid Cells (2n)
# of Homologous
Chromosome Pairs
in Diploid Cells
# of Chromosomes
in Haploid Cells (n)
Homo Sapiens
2n = 46
23 pairs
n = 23
Fruit Fly
2n = 8
n=4
Housefly
2n = 12
2n = 44
4 pairs
6 pairs
22 pairs
n = 22
Bat
n=6
Complete the rest of the FRONT of this handout on your own.
If you have any questions, please raise your hand.
Once you finish the front AND get it checked by me,
begin working on the back of this handout until we move
on.
Meiosis and Genetics Packet – pg. 1
Mitosis
Asexual Reproduction
Meiosis
Sexual Reproduction
Somatic Cell
Gamete (Sex Cell)
body
Any cell forming the __________
Reproductive cells that unite
of an organism, not a sperm or
egg cell.
Examples:
Heart cell, liver
cell, skin cell
during sexual reproduction to
form a new cell called a zygote.
Examples:
Sperm cell or egg
cell only!
Meiosis and Genetics Packet – pg. 1
Diploid
2 complete
Cells containing ____
Haploid
half the
Cells containing __________
sets of chromosomes.
number of chromosomes as
diploid.
This means a haploid cells only
contains one complete set of
chromosomes.
How to write it:
____
2n ( ____
n + ____
n = ____
2n )
How to write it:
____
n
Human ex.:
n = ____
23 in sperm cells
____
n = ____
23 in egg cells
____
Human ex.:
2n = ____
46 in all somatic cells
____
Meiosis and Genetics Packet – pg. 1
Mitosis
Meiosis
Location of Process
Location of Process
all somatic cells
in the ovaries or testes
Fertilization
Fertilization
Process of fertilizing an egg,
Draw it:
female egg, or plant involving the
fusion of male gametes to form a
zygote.
This is what your cells look
like in G1, then during S
phase, the chromosomes are
duplicated to look like this:
1 division
2 identical
daugher cells are
created
Meiosis and Genetics Packet – pg. 2
•
Follow along as we fill out
SECTION 2 of your packet.
• Pay special attention to:
– Type of cell that’s produced
– Crossing Over
– # of Divisions
– # of Daughter Cells
– Genetic Variation
1st division
2nd division
4 non-identical cells are
created, genetically
varied
Meiosis and Genetics Packet – pg. 1
Crossing Over
Crossing Over
The exchange of genes between Draw it:
homologous chromosomes,
resulting in a mixture or parental
characteristics in offspring.
Nondisjunction
The failure of homologous chromosomes or sister chromatids to
separate properly during cell division.
Example: Down Syndrome, Turner’s Syndrome, Kleinfelter’s Syndrome
Picture Review Practice
For each picture, write down the following:
# of daughter cells: 2 or 4
Type of division: Meiosis or Mitosis
Type of cell: Somatic of Gametes