Genetics Practice Midterm 2022 - Couch

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University of British Columbia *

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121 - 003

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Biology

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Feb 20, 2024

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pdf

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!"#$%&% &(&&)% *+, !+-.. /0123 Genetics Practice Midterm 2022 %4 Answer all questions in the space provided. 2) Writing can be in pencil or ink, but pencil, erasable ink or answers with white-out cannot be remarked. 3) Answers may be in sentences or point form. Illustrations are acceptable but must be annotated. 4) Students suspected of any dishonest practices will be immediately dismissed from the examination and will be subject to disciplinary action. 5) Other than a one-page (double-sided) study sheet, no other memory devices are permitted. Study sheets that exceed the size limit may be confiscated and may be considered as cheating. 6) Make sure you have 6 pages (3 pieces of paper) including this cover page.
Question 1 The picture below shows the chromosomes in a cell from an F1 plant at G1 and one of the products of meiosis. For this activity, if crossing-over occurs, assume that only one crossing- over event occurs per chromosome per meiosis (i.e. only one pair of chromatids will be recombinant). Cell from an F1 individual at G1. One of the four gametes produced 1a) What is the ploidy of the F1 individual? _______________________ 1b) What is the haploid number of the F1 individual? ____________________ 1c) Considering only the genes and alleles diagrammed in the figure above, how many different haploid genotypes can be produced by the F1 individual? number of possible haploid genotypes = ___________________________ 1d) If the parents of the F1 individual were pure breeding, what are all the possible genotypes of the parents that generated this F1 individual? 1e) In the table below (on the next page), draw cells at each of the stages given in column 1. Your drawings must reflect the specific arrangement(s) of chromosomes that will give rise to the gamete shown above. You will need to draw the other haploid products resulting from this meiosis. Show the spindle or use arrows to indicate the direction of chromosome movement (if relevant), and clearly label the genes and alleles on all of the chromosomes or chromatids. You may use either bars or straight lines to represent chromatids. Chromosomes should be diagrammed as condensed at all stages for clarity.
Stage of the Cell Cycle Diagram of chromosomes at the given stage Cell at Anaphase of Meiosis I The 4 resulting gametes. One gamete is shown.
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