Monday: B Day

Aim: What is incomplete dominance?

Do Now: Take the reteaching worksheet and complete the chromosome number reveiw questions.

Procedure: We will revisit the human traits that we discussed in the last chapter: earlobe attachment, dimples, thumbs, cleft chin, straight hair, etc. You know the difference between a recessive trait ans a dominant trait. There are some traits that are neither totally recessive or totally dominant. This is called incomplete dominance.  If you put a piece of blue glass over a piece of yellow glass you would see green. If one was dominant and the other recessive the dominant would show, however in incomplete dominance a new trait shows, one that is a blend of the dominant and recessive traits. Blend pure dominant snapdragons with pure white snapdragons and the offspring are pink. The genes themselves DO NOT combine. If two pink snapdragons are mated they produce, one red, one white and two pinks again.  Discuss red blood cells. Look at the transparency master and explain incomplete dominance. Sickle cell anemia is a genetic disorder in which all the red blood cells are shaped like sickles. This is hereditary. EXTRA CREDIT: Discuss this ethical question in a one page paper: Can couples choose the sexes of their children? See page 569 for situations: Write the situation you chose and explain your answer scientifically and morally.

Homework : There will be a notebook check tomorrow. Your homework is to organize your materials in your binder and worksheet folder.

Tuesday: A Day

Aim: What human traits show incomplete dominance?

Do Now: Using the table for Blood types and genes on page 575 of Glencoe text, create two punnett squares to show the expected results of the blood type of offspring if the following parents mated. Type O with Type B and Type AB with Type A. What are the results? Draw the key, the cross and the explain the results.

Procedure: Are you color blind? Draw an example of female genes and male genes on the boar. Show four sex linked genes. Blood clotting, color vision, tooth color, and skin dryness. Explain how a make is nore likely to be born with color blindness than a female. Color blindness is a problem in which red and green look like shades of gray or other colors. Have students all take the color blindness test. Use the overhead with a color blindness transparency and ask each student to come up and tell you what they see on the transparency. Then have students predict results if a woman with CC genes and a man with a c gene on his X chromosome had children. Create punnett square. Use the reteaching worksheet for colorblindness.

Homework #16 : The gene for nearsightedness in humans is found on the X chromosome. A boy has a nearsighted father. Does this mean the boy will become nearsighted. Why or why not? Explain your answer.

Wednesday: B Day

Aim: Which human traits are more common?

Do Now: Students must get lab folders, record lab. Lab #22 Human Traits. Give students a Glencoe text book and have them turn to page 577. Students will have to copy the data table onto a sheet of paper: Trait: Dominant or Recessive

Procedure: Allow students to choose a partner adn have them check one another for each of the traits. They must place a check mark in the table if they have the dominant or recessive trait. The dominant and recessive trait is located on the bottom of the page in a chart already completed. I will draw the same table on the board and we will compare results when finished. Students must answer all the questions for the lab. Data and observation 1-2 and Analyze and Apply 1a, b, c and 2.  Have students in period 6 change brood and give the ducklings water and food.

Thursday: A Day Intercultural Fair

Aim: What are genetic disorders?

Do Now: Write five words on the board and make most of the letters backwards. Ask students to read these and define them. This will lead us into our discussion of genetic disorders. One of them being dyslexia. Take a Glencoe text to your desk. PAGE 578-580

Procedure: Explain how errors in chromosome numbers can occur during meiosis when the sister chromatids are supposed to pull apart and don't. They get stuck together. This is called dysjunction.  Read this directly from the text book and allow students to look at diagrams to help understand the concept. PUT THE IDEA MAP ON BOARD AS NOTES. The inablility to produce sex cells and death are resluts of haveing dysjunction in your chromosome patterns. Down sydrome comes from having an extra autosome (body cell). Genetic disorders such as hemophelia are caused by having the gene for the disorder. It almost always shows up in males. Can a female get hemophelia? How? Explain. Dyslexia is also a disorder caused by a dominant gene inherited on a body cell. Use the SKILL worksheet to look at genetic disorders in newborn babies and practice graphing skills.

Friday: B Day      THIRD QUARTER ENDS

Aim: What does it mean when you hear "It Runs In The Family"?

Do Now: Using your text book define Genetic Counseling: Page 580

Procedure: Discuss genetic counseling and why there may be a need for it within a family. Use the questions on page 580 as a guide and have children chart how a child would get cystic fibrosis from two parents that do not have the disease.  Distribute study guide packets and begin reviewing chapter 27 for out test next Tuesday.