A crash course in Meiosis

Yesterday C period wrapped up the meiosis objectives.  We reviewed the slides to answer any questions you had from the homework and used shoes and crayons to demonstrate what happens to the chromosomes during crossing over and eventually the creation of haploid gametes.  We concluded class with a Crash Course in Meiosis.



Homework reminder: your post lab questions are due on Wednesday.

Nondisjunction Disorders

Today students did a jigsaw activity to learn about six different types of nondisjunction disorders:
* Down Syndrome
* Edward's Syndrome
* Patau Syndrome
* Klinefelter Syndrome
* Turner Syndrome
* XYY Syndrome

Karyotype of a female with Trisomy 21 from Nature.ca

For homework, complete the vocabulary self evaluation on page 12 of your packet.

Below is a graph for the incidence of Down Syndrome relative to the age of the mother during pregnancy.

Read more about Down Syndrome testing in this New York Times article.

Meoisis I

Today we started to learn about Meiosis.

Homework:

Draw the stages of Meiosis II.  Make sure to label the centrioles in at least one picture.  Draw these pictures at the top of page 7 in your packet.

http://images.tutorvista.com/content/cell-reproduction/meiosisii-stage.jpeg

Homework for Friday

G period - complete the vocab for pages 1 - 4.

Both classes:

Read and take notes on section 11-4 in your book (starting on page 275) for a reading quiz.  Focus on the key concepts and vocabulary.  To help focus your notes, consider answering the section assessment questions on page 278.   NOTE:  Drawings of the stages of meiosis are NOT required for the reading quiz.  We will be doing an activity in class on Friday where we work with the stages of meiosis and spend time drawing them.

Still struggling? Sing along to the Meiosis Square Dance Video!

Variations on Mendel

G period:
Today we completed page 3 in the packet and learned about test crosses and pedigrees.  Spoiler Alert!  If you haven't seen the last Harry Potter movie, this pedigree will ruin the end for you.

It's not very efficient to draw complete portraits for a pedigree.  Instead scientists uses symbols (circles or squares) and shade them in to designate if an individual is affected, unaffected or a carrier.

G Period Homework - Read the post below for information on amniocentesis and chorionic villus sampling.


C period:
Today we completed page 5 in the packet and learned about variations on Mendel's principles: incomplete dominance, codominance, pleiotropy and polygenic inheritance.

C period homework:  Read section 11-4 (starting on page 275) and take notes for a reading quiz.  Keep the main points of the reading in mind.  You do not need to draw the stages of meiosis, we will do an activity for this in class.

Meiosis & an Update

UPDATED: Instead of a quiz on Tuesday on Chapter 11, you will have a test on Chapter 11 on Friday. Your packet and the worksheets you have been given are your study guide.

Need a reminder about meiosis, watch the Meiosis Square Dance below.



Homework: You have been emailed the Dragon Genetics Lab. Read through the ENTIRE lab. You will have a five question prelab quiz on the lab. You may take notes to use on the quiz. I will have printed copies of the lab for you to use in class.

Quiz and Meiosis

Today students had a 20 minute quiz on sections 11.1-11.3. After which we started to learn about meiosis.

..
We watched the video clip above and then took notes on the individual stages of Meiosis as well as the difference and importance between haploid and diploid cells.

Homework: Draw and label the stages of meiosis (from pages 276-277 in your book).