Opening Activity: May 8, 2017 Turn in worm explanation in basket! Pick up NB 8 rubric at front table due 5/11 When might a change in the DNA sequence have no effect on the traits? Where would a change in the DNA sequence make the greatest difference in the protein sequence? How do you think these changes might affect your life? Will these be passed onto your children? Explain. I can… Explain why people tan. Predict inheritance patterns. Homework: Worm Explanation - 5/8 Journal Check 8 – 5/11 ALL Quiz retakes by 5/12

Back to Initial Ideas.. Why do people tan? BY YOURSELF: Review your ideas from 3 weeks ago. In a different color add new ideas to help explain why people tan. SHARE: Discuss with your table. What are your common ideas?

See substitute if you need directions or new organisms to compare. Opening Activity: May 9, 2017 Find your “Variation- Initial Ideas” we taped into your journal yesterday. Who do you agree with and why? Rest of class period – work on “Reproductive Strategy Poster”. DUE TODAY at end of class! See substitute if you need directions or new organisms to compare. I can… Compare reproductive strategies for two organisms. Homework: Worm Explanation - ASAP!!! Journal Check 8 – 5/11 ALL Quiz retakes by 5/12

I will stamp your Initial Ideas from yesterday. Opening Activity: May 10, 2017 I will stamp your Initial Ideas from yesterday. Pick up Lab #20 at front table = tape in!! List one new vocabulary word you identified yesterday – what does it mean? I can…Explain how functional/non- functional traits passed onto offspring. Homework: Worm Explanation - ASAP!!! Journal Check 8 – 5/11 ALL Quiz retakes by 5/12

Lab #20 Patterns of Inheritance How are traits passed onto offspring? Follow directions on the lab handout. Be prepared to share your results. Widow’s Peak

What are the allele combinations for each: Widow’s peak Opening Activity: May 11, 2017 Explain how the two traits were expressed yesterday: Widow’s peak or no widow’s peak. What are the allele combinations for each: Widow’s peak No widow’s peak I can…Explain how functional/non- functional traits passed onto offspring. Homework: Worm Explanation - ASAP!!! Journal Check 8 – today! ALL Quiz retakes by 5/19

NORMAL CELL DIVISION CELLS HAVE 2 COPIES OF EACH CHROMOSOME—WE GOT ONE FROM DAD AND ONE FROM MOM CELLS DIE, NEED TO BE REPLACED, ORGANISMS GROW, ETC—SO CELLS DIVIDE SO HOW DO THE CELLS MAKE SURE THAT BOTH NEW CELLS HAVE THE RIGHT NUMBER OF CHROMOSOMES? ?????

BUT WHAT ABOUT REPRODUCTIVE CELLS?

If parents have two copies of each chromosome, how do they pass on only one to their offspring? MEIOSIS is the process of cell division that decreases the number of chromosomes to make sperm or egg cells Original cell Sperm or egg cells

The purposes of Meiosis: Split the total number of chromosomes in half so that only ONE chromosome from each pair is inherited from each parent. Produce variation in offspring by randomly sorting the chromosomes.

Meiosis Diploid (2n) (pairs of chromosomes) Haploid (1n) Original cell Diploid (2n) (pairs of chromosomes) Sperm or egg cells Haploid (1n) (single chromosomes)

Meiosis MOM R r DAD R r