1. The Process of Making Sex Cells
Meiosis
The Process of Making Sex Cells

2. Sexual Reproduction Most organisms reproduce sexually.
This means _______________ parents are needed to produce offspring.
This requires a _____________ cell from each parent.

3. What are sex cells?
Sex cells are the cells that produce _______________.
The sex cell produced by males is ________________.
The sex cell produced by females is the ___________.

4. What are chromosomes?
They are found in the nucleus of cells and are made of ___________
They determine all of the physical characteristics of organisms.
_______________, or genes, are on the chromosomes.

5. What are chromosomes?
Different organisms have different numbers of chromosomes. Humans have ___ pair for a total of __.

6. Sutton & Grasshoppers
Walter Sutton used a microscope to count the chromosomes in ____________________ cells.
He counted ___ chromosomes in every cell, except the sex cells. Those cells only had ___ chromosomes.

7. What did Sutton learn?
He figured out that grasshoppers must get _____ their chromosomes (and alleles) from the female parent and ________ from the male parent.
12 chromosomes in the egg
+ 12 chromosomes in the sperm
24 chromosomes in the cells of the fertilized egg or __________

8. What is meiosis?
The process where the number of chromosomes in body cells is reduced by __________ in sex cells.
This happens through a series of stages.

9. Summary of Meiosis
The ___________________ are made of DNA. DNA is a chemical that gives living things their traits.
Alleles are on the chromosomes.
You may have your mother’s eyes and your father’s nose because of the DNA you received from each parent through your father’s sperm and your mother’s egg.

10. Asexual Reproduction
Asexual reproduction is where offspring are produced by only _________ parent.
Since offspring receive all of their genes from that one parent, they are ____________ to that parent.
Two examples of asexual reproduction are __________ and _________________________.

11. Budding These are bacteria reproducing
by binary fission.
These are yeasts reproducing by budding.