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BIOS 140 Observing Human Phenotypes Worksheet

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Question;Objective:We will learn to observe inherited phenotypes and predict outcomes based on specific pedigreecharts.Part I:Given below are some of the inherited traits. Based on the phenotype, predict the genotype.You may have to consider more than one possibilities of a genotype for some of the traits. (2points each)Notes to Students: If you are doing the lab in the class room, calculate the ratio in the classroom. Online students should ignore the question.Bent little finger: A bent little finger is dominant over a straight finger. If you hold the two littlefingers next to each other with your palms facing you, the last segment of the bent little fingerswill move away from each other and towards the ring finger.B= Bent little finger, b= straight fingerYour genotype= ____________________Ratio in the class room= ______________Widow?s Peak: The presence of widow?s peak is dominant over straight hair line. A widow'speak is a distinct pointed peak in the hairline in the center of the forehead. Straight hair linemakes almost a horizontal straight line across the forehead.P= Widow?s peak, p= Straight HairYour genotype= ____________________Ratio in the class room= ______________Dimples: Dimples on the cheeks is dominant over no dimples.D= dimples, d= No dimples1Observing Human PhenotypesYour genotype= ____________________Ratio in the class room= ______________Freckles: Presence of freckles is dominant over no or very few freckles.F= Freckles, f= No frecklesYour genotype= ____________________Ratio in the class room= ______________Ear lobes: Free ear lobe is dominant over attached ear lobe.E= Free ear lobe, e= attached ear lobeYour genotype= ____________________Ratio in the class room= ______________Tongue rolling: The ability to roll tongue into a U-shape is dominant over the lack of this ability.R= Tongue rolling, r=non-tongue rollerYour genotype= ____________________Ratio in the class room= ______________Hair color: Non-red hair is dominant over red hair.H= non-red hair color, h= red hairYour genotype= ____________________Ratio in the class room= ______________Middigital hair: Middigit is the middle segment of a finger. Hairy middigits are dominant overhairless middigits.M= hairy middigits, m= Hairless middigitsYour genotype= ____________________Ratio in the class room= ______________Part II:2Observing Human PhenotypesScenario 1: Given below is a pedigree chart of a family showing inheritance of straight eyes(shaded) or crooked eyes (open). Squares indicate a male and circles indicate a female.Based on the chart below, fill the blanks below and determine the genotype of all members ofthe family. (5 points)Assumption:A = _______________(straight or crooked)a = _______________(straight or crooked)What type of eyes would each genotype have (straight or crooked)?AA = ____________Aa = ____________aa = ____________Pedigree Chart:Genotype of Grand children: (Show for both alleles) (1 point)Is straight eyes inherited as a dominant or recessive trait? (1 point)Scenario 2: Given below is a pedigree chart of a family showing inheritance of Large ears(shaded) or small ears (open). Squares indicate a male and circles indicate a female. Based3Observing Human Phenotypeson the chart below, answer the questions below and determine the genotype of all members ofthe family. (5 points)Assumption:A = _______________(large or small)a = _______________(large or small)What type of ears would each genotype have (large or small)?AA = ____________Aa = ____________aa = ____________Genotype of Grand children: (Show for both alleles) (1 point)Are large ears inherited as a dominant or recessive trait? (1 point)4Observing Human Phenotypes

 

Paper#62824 | Written in 18-Jul-2015

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