Do Now What is the purpose of mitosis? 2. How many daughter cells are created after mitotic cell division? 3. What type of reproduction is mitosis? 4. What type of cells undergo mitosis?

U5-1 15 minutes

CFU Check for Understanding “I don’t know” is NOT an acceptable response in this class!! INSTEAD What did you mean by… How did you… Why is it that… Can you explain… What are some other examples of… What is the difference between…

Objective Check Compare and contrast asexual and sexual reproduction 1 minute to think 2 minutes to talk

unique ZYGOTE

How many chromosomes?! n (23) n (23)

somatic 46 sperm egg 23 n (23) n (23)

CFU “I don’t know” is NOT an acceptable response in this class!! INSTEAD What did you mean by… How did you… Why is it that… Can you explain… What are some other examples of… What is the difference between…

Sexual life cycle (2n) mitosis fertilization (n) (2n) meiosis mitosis

Sexual growth 2n identical gametes 1 YES gametes

Mitosis Vs. Meiosis

Meiosis Animation http://www.stolaf.edu/people/giannini/flashanimat/celldivision/meiosis.swf

CFU “I don’t know” is NOT an acceptable response in this class!! INSTEAD What did you mean by… How did you… Why is it that… Can you explain… What are some other examples of… What is the difference between…

Independent Practice Mitosis & Meiosis 7 min.

Exit ticket 1. What type of reproduction is meiosis? 2. What types of cells are haploid? 3. What are 2 types of gametes? 4. Name two differences between mitosis and meiosis.

Key Points for Today Asexual or sexual? Changes in chromosome #? # cell divisions? # cells produced?

Do Now What does haploid mean? Give an example of a cell that is haploid. Give an example of a cell that is diploid. What is a zygote? How is it formed? What are processes A & B in the picture below?

Meiosis Cut Out Activity Use your textbook pages 276-277 Cut out each phase of meiosis (8 phases total) Label each phase Do not worry about Interphase I Provide a brief explanation of what is happening in each phase

PUT ALL BOOK BAGS UNDERNEATH TABLES!!!! IN COMPLETE SENTENCES….. DO NOW PUT ALL BOOK BAGS UNDERNEATH TABLES!!!! IN COMPLETE SENTENCES….. Compare and contrast asexual and sexual reproduction. What is a gamete? Give an example. 3. Define diploid.

Genetic Variation U4-16 AKA: why you don’t look exactly like your mom or exactly like your dad!

Homologous Chromosomes A pair of chromosomes, one from mom and one from dad, each has the same genes! Separates during first division, 2n  n

Exchanging genes between homologous chromosomes differences Exchanging genes between homologous chromosomes A mix of genes gets passed on

CFU “I don’t know” is NOT an acceptable response in this class!! INSTEAD What did you mean by… How did you… Why is it that… Can you explain… What are some other examples of… What is the difference between…

Objective Check How does crossing over cause genetic variety? 1 minute to think 2 minutes to talk

Changes in a DNA sequence Good, bad, or neutral mutations Sickle Cell Disease

Objective Check How do gene mutations lead to genetic variety? 1 minute to think 2 minutes to talk

Chromosomes fail to completely separate Extra chromosomes (ex: Down Syndrome) Chromosomes fail to completely separate The union of male and female gametes to form a zygote Makes completely UNIQUE organisms

Objective Check How do non-disjunction, fertilization, and pollination lead to genetic variety? 1 minute to think 2 minutes to talk

CFU “I don’t know” is NOT an acceptable response in this class!! INSTEAD What did you mean by… How did you… Why is it that… Can you explain… What are some other examples of… What is the difference between…

Nondisjuction & Klinefelter Syndrome

Independent Assortment Alleles of different genes separate independently of each other Bb – moms brown hair When makes eggs via meiosis… One egg gets b, another egg gets B

Why is independent assortment important? Greater genetic diversity!

Independent Practice EOC Practice 20 min

Exit Ticket 1. What type of reproduction is meiosis? 2. What type of cells are haploid? 3. What are the 2 types of gametes? Explain in a complete sentence why genetic variation is necessary. Name 2 sources of genetic variation.