Bio253Sec1_Exam1_F21

TEST 1 Fall 2021 253L Section 1 Name:___________________________________________________ Date:____________________________________________________ Tuyere Ta 09117/21

___/20 1. When using OMIM to research Tay-Sachs, you find that the gene responsible for this condition is located at 5q33.1. With this information, you can say that the gene is found on the _____ arm of chromosome number _____. (4 points) a. Short; 5 b. Long; 1 c. Long; 5 d. Short; 1 e. Not enough information to determine this 2. Provide three of five reasons why an organism (such as B. rapa) is considered a model organism. (6 points) 1. ______________________________________ 2. ______________________________________ 3. ______________________________________ 3. Use the following terms to label the flower . (10 points) a. Filament b. Ovule c. Petal d. Stigma e. Anther 0 Short life - span Easy to work with Doesn't self - pollinate D A F- B C

___/20 Exam Total ___/50 5. The two B. rapa plants (A and B) are the parents you will need to cross. Plant A: Purple stem, green leaf Plant B: Non-purple stem, yellow-green leaf a. Based only on the color of stem and leaves, what are ALL the possible genotypes for these two plants using the correct allelic notation for stem and leaf color from your lab manual? (5 points) Plant A: _________________ Plant B: ___________________ b. Carry out a dihybrid cross between Plants A & B. Perform the cross assuming that the plant is heterozygous for the dominant phenotypes/traits. If a dominant trait is present, please use the heterozygote genotype. (5 points) Plant A gametes Plant B gametes c. What is the phenotypic ratio of the offspring? (5 points) d. What is the genotypic ratio of the offspring? (5 points) AAYY or AAYY aayy Aoilyxaayy AY Ay AY ay ay AaYy Aayy aaYy aayy ay AaYy Aayy aaYy aayy ay Aayy Aayy aayy aayy ay AaYy Aayy any aayy P G PYG GG GYG 1- Purple stem , green leaves : 1- Purple stem , yg leaves : 7- greenstein , green leaves : 1- greenstein , yg leaves I :| :| :| 1AaYy : 1- Aayy :1aaYy : Iaayy I :L ! I :|