1. Biology Discussion Notes Tuesday 1/13/2015

2. Goals for the day 1.Be able to describe a karyotype and what they might be used for 2.Be able to determine whether a karyotype belongs to a male or female by identifying and interpreting the sex chromosomes. 3.Be able to describe what could happen if something goes wrong in meiosis

3. Question of the Day 1/13 How does Meiosis differ in males & females?

4. Meiosis in males makes 4 equal sperm Meiosis in females makes 1 huge egg

5. Sex Chromosomes X & Y are the “sex” chromosomes, they determine if you are male or female people have two (Usually). This is just 1 of your 23 pairs of chromosomes. What two sex chromosomes do males have? What two sex chromosomes do females have?

6. Sex Chromosomes “Who” determines whether the baby will be a boy or a girl (Mom or Dad)? MalesFemales

7. Karyotype – a picture of chromosomes Males – XY Females XX

11. Non-Disjunction Junction? DisJunction – Non-Disjunction -

12. Non-Disjunction

15. Karyotyping- Amniocentesis

16. Karyotyping Lab Work in groups of 2 or 3 Start helping each other cut As you accumulate chromosomes one person can start matching & pasting Work on questions once you have all your chromosomes on. EXTRA CREDIT OPTION: –When you are finished look up other syndromes caused by having to few or to many chromosomes. – write them down & describe them for extra credit on your lab sheet

17. Business Skills Check tomorrow – VERY similar to practice skills check, so if you have a question on that ASK IT! Meiosis Reading Guide –DUE TOMORROW –Only accepted if 100% complete!

18. Species of the Day 1/13 Downy Woodpecker –Picoides pubescens

19. Species of the Day 1/13 Downy Woodpecker –Picoides pubescens