1. What are the genotypic and phenotypic ratios of...
1. Homozygous Tall Pea Plants x
Homozygous Short Pea Plants
T = tall, t = short
2. Heterozygous Round Seed Shape x
Heterozygous Round Seed Shape
R = Round, r = wrinkled
3. Heterozygous Yellow Seed Color x
Homozygous Green Seed Color
Y = yellow, y = green

2. Meiosis
Gametogenesis
and
You

3. Review of Mitosis What is it? Purpose?
asexual, cellular reproduction
results in clone of the parent cell
Purpose?
replace damaged/dead cells (tissue repair)
# of cells produced from 1 parent cell?
2 daughter cells from 1 parent.

5. I. Meiosis (Gametogenesis)
A. Purpose
1. to maintain chromosome # in the species.
2. involves gametogenesis
a. creation of gametes (sex cells – sperm and egg)

7. I. Meiosis (Gametogenesis)
B. Background
1. parent cells contain 2 copies of each gene (diploid)
a. each pair of chromosomes are “homologous” to each other
1. same traits arranged in the same order
2. not necessarily identical (due to alleles)

9. I. Meiosis (Gametogenesis)
B. Background
2. gamete parent cells split homologous chromosomes apart as they divide to become gametes

11. I. Meiosis (Gametogenesis)
C. Meiosis
1. Prophase I
a. chromosomes form
2. Metaphase I
a. homologous chromosomes pair equator
b. bind tightly to each other
1. “crossing over”

13. I. Meiosis (Gametogenesis)
C. Meiosis
3. Anaphase I
a. chromosomes pulled to the poles
4. Telophase I
a. two daughter cells result
b. each cell now “haploid”

15. I. Meiosis (Gametogenesis)
C. Meiosis
5. Daughter cells now go through mitosis (due to extra genetic material)
a. Prophase II – Metaphase II – Anaphase II – Telophase II
***END RESULT***
Each parent cells creates 4 daughter cells