Week+3+-+Homework+Assignment+%28Inheritance+of+Traits%29+PDF

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School

University of British Columbia *

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Course

121

Subject

Biology

Date

Feb 20, 2024

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pdf

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4

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UBC 2023W2-BIOL121-223– not for resale Week 3: Homework Assignment (Inheritance of Traits) Due date: Wednesday, January 31st, 11pm Note: This worksheet is marked based on meaningful completion. You should still try this homework assignment so that you can get a feel for how we phrase exam questions in BIOL 121, and for you to practice writing your answers with thorough explanations in a logical style. Please do this assignment independently so that you can get the most realistic practice for an exam situation. Answer the homework questions below. Instructions: 1. After downloading this file, type your answers to the homework questions in the spaces provided using the annotation tool in Adobe Acrobat (Go to ‘View’ à ‘Tools’ à ‘Fill & Sign’ à ‘Open’) If the question asks you to draw something, you can: a) Draw the diagram on a piece of paper, take a photo, and paste a digital photo of your drawing into your document, OR b) Create a diagram using your computer and include it in your document. Either methods are fine, just make sure that the image is clear and easy to understand J 2. Save the document (containing both the questions and your answer). The name of this file should include your full name and your student ID number. You should always save a copy of your homework – hold on to this!) 3. Acceptable file formats for submitting your homework assignment on Canvas: Microsoft Office Word (.docx or .doc) PDF (you do this by saving your word document as PDF – this is an option you can selecting the file format as PDF) We are not able to accept Pages (.pages) documents 4. Upload the file containing your responses using the Canvas Assignment system Go to the ‘Assignments Link’ on the main page Click the Week 3 Assignment link You should be prompted to upload a document attachment file (best as a PDF) Name: Student Number: Heather 64084643
UBC 2023W2-BIOL121-223– not for resale 1. In tomatoes, yellow flowers (F) are dominant to white flowers (f) and thick stems (T) are dominant to thin stems (t). Pollen from a tomato with thick stems and white flowers pollinates a tomato with thin stems and yellow flowers. The F1 all have thick stems and yellow flowers. When you perform a testcross on the F1s, if the genes segregate independently, what phenotypes do you expect and in what ratio do you expect these phenotypes to occur? ( A testcross is when one crosses an organism of an unknown genotype with that of an organism with homozygous recessive genotype .) ( 3 marks ) Insert your answer here:
UBC 2023W2-BIOL121-223– not for resale 2. When you perform a testcross on these F1 tomatoes, if the genes are linked with no crossing over, what phenotypes do you expect and in what ratio do you expect these phenotypes to occur? You don’t have to show your work. ( 3 marks ) Insert your answer here:
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UBC 2023W2-BIOL121-223– not for resale 3. What results do you expect from the testcross if the genes are linked and close to each other? Crossing over can happen. Show all your work. ( 4 marks ) Insert your answer here: