Human Genes CIM Lab Opportunity

Before you begin your investigation you will check your understanding of Genotypes Phenotypes Alleles The possible combinations for each trait by filling out the following table

Your Genes Genetic Trait Possible Phenotypes in Population Your Phenotype AllelesPossible Geneotypes in Population Your Possible Geneotype Ability to roll tongue Type of earlobe Type of thumb Type of hairline Freckles Dimples

Ability to roll tongue Tongue Roller Non-tongue Roller

Type of earlobe Free Lobe Attached Lobe

Type of thumb Normal Hitch Hikers

Type of hairline No Widow’s Peak Widow’s Peak

Type Freckles Freckles No Freckles

Dimples

Your Genes Genetic Trait Possible Phenotypes in Population Your Phenotype AllelesPossible Geneotypes in Population Your Possible Geneotype Ability to roll tongue Type of earlobe Type of thumb Type of hairline Freckles Dimples

Part 1: Background for Examining the Frequency of Each Trait in the Population

Your CIM lab should begin with a… 1.Title: Write a title below that is specific and includes detail about your investigation. 2. Question: Is the dominant trait in a population always more common than the recessive? 3.Hypothesis: Write your hypothesis below. Remember, a hypothesis should be in the ‘If…, then….’ format, and should state a relationship between your two variables.

Page 1 Page 2 Hint: do this page last.

Now you need to write your Background Information A: 1.Background Information should explain the terms and concepts you need to know to understand your investigation. 2.It should also explain the reasoning that backs up your hypothesis. 3.The Background Information should not contain the results of your investigation (this information will be discussed in your conclusion).

Now you need to write your Background Information B: This should be at least three long paragraphs You need to demonstrate that you have done additional research online besides what was done in class.

Now you need to write your Background Information C: You should answer the following questions in your Background Information: What is a trait? What is the difference between a phenotype and a genotype? What are alleles and where do they come from? What do we mean when we say a trait is dominant or recessive? How will we look at frequencies in our population? How do the above questions relate to your hypothesis? What you know about the individual trait(s) after doing online research.

Part 2 Materials & Procedures

Materials We will not have many materials for this lab but you should list any that you use.

Procedure A at least 40 Conduct a survey of at least 40 people in your school or community to see what their phenotype is for each of the following 3 traits: 1.Widow’s Peak 2.Ability to roll tongue 3.One other trait of your choice from the first page of your handout.

Procedure B Remember to list your: 1.Independent variable 2.Dependent variable 3.Control variable(s)

Procedure C Be sure that you give a detailed description of the steps you used to collect your data. You should describe the questions that you asked, how you decided who to ask, any determinations you made about your populations, and difficulties that you encountered in the procedure. Write your procedure in steps. Include any drawings that illustrate what procedure you followed.

Part 3 Presenting the Data

Collecting Data You will need to design a data table on another sheet of paper that will include the name of each person you surveyed and the results of the survey. Name Widow’s Peak No Widow’s peak Can Roll Tongue Cannot Roll Tongue Has Choice Trait Does not have Choice Trait Suzy Que Billy Bob Smith Dr. Suess Matt Utterback E. Stratton (mom)

Percentage Calculations each For each of the 3 traits you have collected data for 1.widow’s/no widow’s peak, 2.rolling/not rolling tongue, 3.the trait of your choice), Calculate the percentage of individuals who show each phenotype.

What your page should look similar to: You may use multiple pages

Part 4 Analysis & Conclusion

Analysis & Conclusion A This is a key part of the investigation where many students lose points in their write-up. You need to explain clearly: What you found out in the investigation (refer to specific data!) Whether it supports your hypothesis or not Why does this happen? What else might you discover about this subject and how would you design an investigation?

Analysis & Conclusion B Analyze the data and draw conclusions by answering the following questions. 1.From the data table on page one: a)Is a widow’s peak a dominant or recessive trait? b)Is widow’s peak or no widow’s peak the more common trait in the population? 2.From the data table on page one: a)Is the ability to roll the tongue a dominant or recessive trait? b)From the data you collected: is the ability to roll the tongue or the inability to roll the tongue the more common trait in the population? 3.Fill in the blanks for the 3 rd trait you surveyed. a)From the data table on page one: Is ___________________________ a dominant or recessive trait? b)From the data you collected: Is ___________________________ or ___________________________the more common trait in the population? Use these answers, and the questions above to help you write your conclusion.

Analysis & Conclusion C Is your hypothesis supported? From the analysis of your data, does dominance correlate with frequency in the population (in other words, is the dominant trait always the more common trait in the population )? Explain your answer using your data. Explain why this happens (this is a very important part of your conclusion)! two Explain two ways in which this investigation could be improved or expanded upon to give more reliable data for the human population. Use these answers, and the questions above to help you write your conclusion.

Don’t forget! Works cited page at the end. The school’s media center’s web pages can help you create your works cited page. CIM Lab rubrics as the last page.