(3rd ed.) Page 1BIO 100 LAB SIGN OFF PAGE - UNIT 6Name ___________________________This is a big packet, so we recommend that you staple Part C: “You’ve Got the Cutest Little Babyface” as its own separate packet. You will use this page to get your Labs for Unit 6 signed off by the Biology Learning Center staff. You need to have all of the following steps initialed by astaff member before you will be allowed to take the Unit 6 Exam.After you have obtained all of your sign offs for this Unit, be sure that a BLC staff member indicates on your Lab Card that you are OK to take the Unit 6 Exam. Also, keep this sign off page, along with your completed lab worksheets, as proof of your lab completion. If your Lab Card indicates that you have not completed the required Labs for this Unit, and you feel that you have, it is up to you to provide proof that you have indeed done the Labs. Keep this page!___________ Unit 6, Step 2A (Single-Trait Genetics Problems for staff check off)(Step 2B does not require a sign off - these are extra practice problems)___________ Unit 6, Step 2C (You’ve Got the Cutest Little Babyface)*BLC Staff: After the student receives his/her last initial on this page, please record that he/she has completed the required lab sign offs for this unit.NOTE: DO NOT ATTEMPT ANY OF THESE LABS UNTIL AFTER YOU HAVE READ THE TEXTBOOK CHAPTER AND VIEWED THE CORRESPONDING STUDY GUIDE!Page 2 of 15THEY PROVIDE THE NECESSARY BACKGROUND INFORMATION.Unit 6, STEP 2A: Single-Trait Genetics Problems (for staff check off)This lab can be done at home, but you will need a sign off from a BLC staff member. After you complete this lab, take your results to the front desk in the Biology Learning Center for a check off.Be sure to view the “Single-Trait Genetics Problems tutorial” on the Biology 100 Course Website before you attempt the following problems. The tutorial is located on the Unit 6 startpage under Step 2A. Single-Trait Genetics Problems (these require a sign off from a staff member) 1. Animals (including humans) who are homozygous recessive for the albinism trait are albinos - their skin and hair appears very white. "M" is the allele for normal melanin production, and "m" is the allele for albinism. Two parents with normal pigmentations are carriers of the gene - they are heterozygous. Draw a Punnett square to illustrate this cross. What is the probability that their offspring will be albino? 2. PTC is a harmless chemical that some people can taste and others cannot. People who chew onPTC paper and perceive a bitter taste are "tasters" and those who don't taste anything are "non-tasters." "T" indicates the taster allele and "t" indicates the non-taster allele. The "taster" allele is dominant. Non-tasters are homozygous recessive. Two parents are heterozygous for the taster(3rd ed.) Page 3trait. Draw a Punnett square. What are the genotypic and phenotypic ratios of their possible offspring? 3. A woman who is a non-taster for PTC has children with a man who is heterozygous for the taster trait. Draw a Punnett square. What are the genotypic and phenotypic ratios of their possible offspring? 4. (This is a true story). At a college fair, the biology department was using PTC paper to demonstrate dominant and recessive phenotypes. A married couple with a baby came up to the demonstration. The husband and wife determined they were both non-tasters. The husband put a strip of PTC paper into the baby's mouth and he made a face and spit it out. To see if it was just paper the baby didn't like, the husband gave the baby a regular piece of paper with no PTC on it. The baby happily sucked on the plain paper. The husband gave the baby another piece of PTC paper, and the baby spit it out immediately and began to cry. A while later the couple was seenPage 4 of 15with the wife crying and the husband yelling. Do you think the husband is the father of the baby? Why or why not? (Hint: Draw a Punnett square and solve this problem like any other single-trait genetics problem)TAKE YOUR COMPLETED GENETICS PROBLEMS TO THE FRONT DESK FOR A SIGN OFF BY A STAFF MEMBER.(Unit 6, Step 2A)______________________________________________________________________________Unit 6, STEP 2B: Additional Single-Trait Genetics Problems for Practice The following problems provide additional practice. You are required to do them (to prepare for the exam), but you are not required to get a sign from the staff member. However, ask for help if you need it! These problems go a little beyond what you have seen in the tutorial and done in Step 2A for check off. In some cases you are not given the full information on the parents, and must instead use Punnett squares to determine their genotypes based on what you know about their offspring.(3rd ed.) Page 5The answers to the extra practice problems are located in Unit 6, Step 2B, of the BIO 100 CourseWebsite. You should check your answers as you complete each of the problems, but don’t look atthe answer until you are done with the problem! If you look at the answers without first trying to solve the problems on your own, you will not get much out of this activity. Use a separate sheet of paper to build your Punnett squares and solve the problems (we have not provided enough space here).5. Both a man and a woman are heterozygous for freckles. Freckles (F) are completely dominant over no freckles (f). What is the chance that their child will have freckles? Show the genotypes crossed, and the probability of each genotype and phenotype that may result from the cross.6. Both you and your sister or brother have attached earlobes, yet your parents have unattached earlobes. Unattached earlobes (E) are completely dominant over attached earlobes (e). What are the genotypes of the parents? What are the phenotypes of the parents?7. A father has dimples, the mother does not have dimples, and all five of their children have dimples. Dimples (D) are completely dominant over no dimples (d). Give the possible genotypes of all persons concerned. 8. Congenital night blindness is caused by a dominant autosomal allele (B). The night blindness allele (B) is completely dominant over the normal allele (b). A man is heterozygous for this trait. What is the probability that his first-born will have the trait, assuming his wife is normal? What is the probability that his second-born will have the trait? Does the man express the trait?9. In humans, pointed