GIZMOS. BIO SBI4U>Genetics 24E Chicken Genetics Gizmo Worksheet (1).ALL ANSWERS CORRECT(100% SCORE)

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Student Exploration: Chicken Genetics Vocabulary: allele, codominance, dominant, genotype, heterozygous, homozygous, phenotype, probability, Punnett square, recessive, trial Prior Knowledge Questio... ns (Do these BEFORE using the Gizmo.) 1. The image shows a flower that was produced by crossing a pure red flower with a pure white flower. Which do you think is the dominant petal color: red or white? Explain. _____________________________________________ _____________________________________________ _____________________________________________ 2. How is the inheritance pattern shown by this flower different from other inheritance patterns you have seen or studied? ___________________________________________________ _________________________________________________________________________ Gizmo Warm-up There are many different ways traits can be inherited. Some traits are governed by alleles that are dominant over other alleles. Other traits are governed by alleles that share dominance. These alleles follow a pattern of inheritance called codominance. With the Chicken Genetics Gizmo, you will study how codominance affects the inheritance of certain traits. 1. Turn on Show genotype. The genotype is the allele combination an organism has. Point to the red chicken. A. What is Whe Ued chickeQ¶V genotype? __________________________ B. What is the ZhiWe chickeQ¶V genotype? ________________________ 2. What do you think the letters F, R, and W stand for in the genotypes? _________________________________________________________________________ _________________________________________________________________________ Layma i The dominant petal colour is red because in the photo there are more red pedals than there are white pedals. F^R F^R F^W F^W The F probably stands for feather, the R stands for red and W stands for white. It’s different because it has both colours on it. Even though the red is dominant, the recessive allele is also present. On a normal pattern, the dominant would cover all of the plant. This study source was downloaded by 100000793680026 from CourseHero.com on 04-20-2021 17:38:28 GMT -05:00 https://www.coursehero.com/file/60734794/Genetics-24E-Chicken-Genetics-Gizmo-Worksheet-1pdf/ This study resource was shared via CourseHero.com2018 Activity A: Codominant traits Get the Gizmo ready: x Drag a red chicken and a white chicken into the SaUeQW bR[eV, bXW dRQ¶W click Breed yet. Question: What inheritance patterns do codominant traits display? 1. Predict: What do you think the offspring of a red chicken and a white chicken will look like? _________________________________________________________________________ 2. Observe: Click Breed. What are the offspring genotypes? ___________________________ AQ RUgaQiVP¶V aSSeaUaQce iV iWV phenotype. DeVcUibe Whe RffVSUiQg¶V SheQRW\Se. _________________________________________________________________________ 3. Experiment: Drag four offspring to the Holding Cages. Click Clear, and then drag one of the offspring to a parent box. Drag a white chicken to the other box. Click Breed several times. Describe the resulting genotypes and phenotypes of the offspring. _________________________________________________________________________ _________________________________________________________________________ 4. Revise and Repeat: Click Clear. Drag another chicken from the Holding Cages to the parent box. Drag a red chicken to the other box. Click Breed several times. Describe the resulting genotypes and phenotypes of the offspring. _________________________________________________________________________ _________________________________________________________________________ 5. Explain: In dominant/recessive inheritance patterns, the dominant allele is always expressed when present. The recessive allele is only expressed when the dominant allele is not present. Use your observations from this activity to describe how codominant inheritance patterns differ from dominant/recessive inheritance patterns. _________________________________________________________________________ _________________________________________________________________________ _________________________________________________________________________ _________________________________________________________________________ I believe that there is going to be a mix of white areas and some areas are going to be red. F^R F^W The chickens had a mix of colours like I predicted. The top of the chicken is white while the bottom half is red. In the case of co-dominant alleles, both alleles are present and dominant. One allele does not mask the other. This is why the phenotype is half and half. But in a dominant/recessive pattern, there is a ratio between the offspring being all red or all white. The result of breeding a white chicken and a mixed chicken is that about half of the offspring have the genotype F^R F^W and a phenotype of red and white feathers. The rest of the offspring have the genotype F^W F^W and a phenotype of pure white feathers. About half of the offspring have the genotype F^R F^W and a phenotype of red and white feathers. The rest of the offspring have the genotype F^R F^R and a phenotype of pure red feathers. [Show More]

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