Transcript mitosis - Denton ISD

Today we will describe the steps that take place to produce our
gametes (sex cells).
What is the name of the process that produces
new cells in our bodies?
How do these daughter cells compare to the
original cells?
Feb. 2
MITOSIS
46
- Interphase (G1,S,G2)
92
- Prophase
I
- Metaphase
- Anaphase
- Telophase
46
46
MEIOSIS
- Interphase (G1,S,G2)
46
- Prophase 1 (crossover)
- Metaphase 1
- Anaphase 1
I
- Telophase 1
46
- Prophase 2
- Metaphase 2
- Anaphase 2
- Telophase 2
92
23
23
46
23
23
Frank Gregorio - Meiosis
Amoeba Sisters - Meiosis
Mitosis
Meiosis
Cell divides once
Cell divides twice
End with two cells
End with four cells
Full set of DNA (diploid) Half set of DNA (haploid)
Identical daughter cells
Genetically different
daughter cells
Produce “regular cells”
(Somatic cells)
Produce “sex cells”
(Gamete cells)
CC - Meiosis
Feb. 17/18
Today we will continue to describe and use some of the tools used to study genetics.
I
II
III
This pedigree shows the appearance of
a widow’s peak in three generations of a
student’s family.
What are the probable genotypes of the
student’s parents?
W – Widow’s Peak
w – No Widow’s Peak
Jane and Joe Smith have dimples,
but their daughter, Clarissa, does
not. Joe’s dad has dimples, but his
mother, and his sister, Grace do
not. Jane’s dad, Mr. Renaldo, her
brother Jorge, and her sister Emily
do not have dimples, but her
mother does.
Using a Pedigree – Cystic Fibrosis (Autosomal Recessive)
Create a pedigree:
• Andy, Penny and David have freckles, but their mother, Mrs. Collins does not.
• Mrs. Jones, Mrs. Collins’ sister has freckles, but her parents, Mr. & Mrs. Lutz, do not.
• Deidra and Darlene Jones are freckled, but their sister, Dixie, like her father, is not freckled.
Why do you think sex linked disorders are more
common in males than females?
Dominant
Recessive
Color blindness is a “sex-linked” trait.
What do you think that means?
Color Blindness Explanation
Colorblindness Test Colorblindness #2
8 / 3
74 / 21
3 / 5