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Genetics Introduction
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The Mandella Environment

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Monday: A Day

Aim: What is heredity?

Do Now: Using the overhead show students a picture of two parent rabbits and their offspring. Ask students to choose the offspring of the parent. Where did the white rabbit come from? Mistakenly placed in with the black rabbits? Discuss.

Procedure: Can offspring show a trait that is not seen in the parents? Distribute pea pods. Ask students to open them up and record the differences and similarities. Have them compare with one another. Expalin how each pea in the pod is like a child in each family. There are similarities but there area lso many differences. Children in families show different traits. Genetics: The study of how triats are passed from parent to offspring. Reveiw the nucleus, chromosome and gene. Traits: Characteristics. Gene: A small section on the chromosome that determines a specific trait  of an organism. Students in the double period will make a construction paper model of a sex cell chromosome and a pair of body cell chromosomes. They must be 20 cm long and they must place 20 genes on their model by using pieces of yarn. They must write why there are some similarities and some differences in the two kinds of chromosomes. ( Cell nucleus-Chromosome- paired in body cells and single in gametes) (Cell nucleus has genes- On the chromosome adn there are two for each body trait in body cells)

Homework # 10: UPCO text book Read page 387-388 Answer Part A Q#1-4 and Part B Q#1-2

Tuesday: No School on Tuesday for Superintendent's Conference Day


Do Now:


Homework #

Wednesday: A Day

Aim: What is heredity continued?

Do Now: Take project material to your desk and complete your chromosome/gene poster.

Procedure: Ask students to list five traits of a human. Five traits of a fly. Create a word splash on the board. Discuss genetic terms with students. Explain the difference between heterozygous and homozygous. Heterozygous have two different genes for the same trait. We call this a hybrid. Homozygous have two of the same kind of genes for that trait. We call this PURE. The genetic makeup of an individual is called a genotype. The appearance of an organism is called its Phenotype (what you see). An organsim can have the same phenotype but different genotypes. RULE: Whenever the dominant trait is present it shows that trait. The dominant trait completely blocks the recessive trait from showing. **Have a sensitivity discussion with students about the fact that a student may be adopted, in foster care of have a deceased parent and not know that parents traits

Homework #11: Read page 395 of UPCO book and complete part H Q#1-5

Thursday: B Day

Aim: How are traits passed from parents to thier offspring?

Do Now: Bring a Glencoe text to your desk. Look at the pictures of the ear types on page 548. Ask someone to tell you what ear type you have and write it down, attached or free.

Procedure: Students will look at a specific trait that is passed down from their parents. Create a table in your notebook using the student name as one variable and the phenotype as another variable. Record the results from your classmates. Put this table on the board. Using the magnetic attached and free sperm and eggs, show students have they received that trait from a make and female parent. Show all the gene combinations for earlobe traits. FREE lobes=dominant and ATTACHED lobes=recessive

Homework#12: Complete the reteaching idea map for traits of plants and animals.

Friday: A Day

Aim: How can knowing the types of genes a parent has be helpful?

Do Now: Do you have brown eyes, blue eyes or green eyes (naturally--no colored contacts please) Once again create a table and record student names and their eye color.

Procedure: What is the difference between expected results and observed results? Review genotype and phenotype again. Explain that their is an easier way to figure out what combinations can occur between the egg and the sperm for an organisms traits. Punnett square: A way to show which genes combine when the egg and sperm join. RULE: Capital letter represents the dominant gene and a lower case represents the recessive gene. Ex: F for free lobe and f for attached lobe. Create a punnet square and explain the expected results for the ear lobe trait. Discuss expected vs. observed results. Then complete a punnet square for eye color. B for Brown eyed and b for blue eyed. Use the overhead to have students practice with punnett squares for other traits. This lab can be completed this week if time permits otherwise it will be done one Monday. Complete Lab 21 Book #26-2. What determines how offspring will look? Page 556 of text. Use white beans and red beans in a paper bag. Use R for doinant red adn r for recessive white. Complete punnett squares to show expected results and then put the beans in the bag and remove one and then another. These stand for the gene combination that results when the egg and sperm join. Record your results in a table. Write a hypothesis for how many RR, rr, Rr combinations you will get in 40 trials. Record resluts and analyze your table and answer questions to complete lab.

Have A Fantastic Weekend!

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