How is a baby made?
On the cellular level, draw how a baby is
made. (NO PHALLIC SYMBOLS
Why does sex exist?
Sexual reproduction creates genetic
How do we get our different traits?
What is the difference between
fraternal and identical twins?
What is mitosis?
What is meiosis?
List 2 differences between the two?
Let’s define the following
reproduction-production of gametes
Cells (egg and sperm) haploid
Cells - diploid
the chromosome number (n)
1 of each pair of chromosomes (23)
of each type of chromosome (2n)
Twice the haploid number
Chromosomes and Chromosome
Human body cells have 46 chromosomes
Each parent contributes 23 chromosomes
Homologous chromosomes —one of
two paired chromosomes, one from each
Depending on how the
chromosomes line up at the
equator, four gametes with
four different combinations of
chromosomes can result
Genetic variation also is
produced during crossing
Think – Pair - Share
Draw out the stages of meiosis using the
following cell. Make sure you draw the cell with
crossing over of only one pair of homologous
chromosomes! (use colored pencils)
Do Now – Period 3
How many sex
What is the sex of
Is this individual
Match the description to the phase of meiosis.
1. Sister Chromatids are pulled
A. Prophase I
2. Homologous chromosomes line
up in the middle of the cell._____
B. Metaphase I
3. 2 daughter cells are formed ____ C. Telophase I
4. Nuclear membrane disappears__ D. Anaphase II
5. Nuclear membrane reforms
around 4 cells ____
E. Anaphase I
6. Homologous chromosomes are
pulled apart ____
F. Telophase II
How does meiosis promote genetic
variability? List 3 reasons why.
THINK – PAIR - SHARE
If a hamster has 44 chromosomes in G1
phase of the cell cycle, then…
many chromatids are in G2 Phase?
How many chromosomes are in the G2
How many chromosomes will be in each cell
after it has gone through mitosis?
What two divisions do your cells undergo?
What are the differences between the
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