UNIVERSITI SAINS MALAYSIA. First Semester Examination 2013/2014 Academic Session. December 2013 / January 2014

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UNIVERSITI SAINS MALAYSIA First Semester Examination 2013/2014 Academic Session December 2013 / January 2014 BBT 301/3 Plant Genetics [Genetik Tumbuhan] Duration: 3 hours [Masa: 3 jam] Please ensure that this examination paper contains FIVE printed pages before you begin the examination. [Sila pastikan bahawa kertas peperiksaan ini mengandungi LIMA muka surat yang bercetak sebelum anda memulakan peperiksaan ini.] Instructions: Answer FIVE (5) out of SIX (6) questions, in English or Bahasa Malaysia. Each question carries 20 marks. [Arahan: Jawab LIMA (5) daripada ENAM (6) soalan yang diberikan dalam Bahasa Inggeris atau Bahasa Malaysia. Tiap-tiap soalan bernilai 20 markah.] In the event of any discrepancies, the English version shall be used. [Sekiranya terdapat sebarang percanggahan pada soalan peperiksaan, versi Bahasa Inggeris hendaklah digunapakai]....2/-

- 2-1. [a] Giving appropriate examples, differentiate between : [Dengan memberikan contoh yang sesuai, bezakan antara :] [i] monoploid chromosome number (x) and haploid chromosome number (n). [bilangan kromosom monoploid (x) dan bilangan kromosom haploid (n)] (4 marks / 4 markah) [ii] euploidy and aneuploidy. [euploidi dan aneuploidi.] (4 marks / 4 markah) Demonstrate and differentiate the adjacent-1, adjacent-2 and alternate form of disjunctions, giving the outcome of the meiotic division. [Demonstrasi dan bezakan bentuk-bentuk disjunksi adjasen-1, adjasen-2 dan alternat, dan berikan hasil belahan meiosis.] (12 marks / 12 markah) 2. [a] Discuss the three mechanisms for male sterility in plants. [Bincangkan tiga mekanisme kesterilan jantan dalam tumbuhan.] (14 marks / 14 markah) List the common goals of plant breeding. [Nyatakan sasaran umum pembiakan tumbuhan.]...3/-

- 3-3. In the onion (Allium cepa), in the presence of allele B, an enzyme catalyzing the production of red bulb color pigment is formed, and white in the bb plant. The allele D prevents this enzyme from functioning and hence prevents pigment production while dd does not prevent the function. The two genes are independently inherited. A true-breeding colored variety is crossed with a white variety having the genotype bbdd. [Dalam bawang (Allium cepa), kehadiran alel B akan menghasilkan enzim untuk mengkatalisis penghasilan pigmen merah biji bawang dan putih dalam tumbuhan bb. Alel D akan menghalang enzim daripada berfungsi dan menghalangkan penghasilan pigmen sementara dd tidak menghalang fungsi enzim. Kedua-dua gen diwariskan secara tidak bergantung antara satu sama lain. Satu varieti membiak tulen berwarna dikacukkan dengan varieti putih bergenotip bbdd.] [a] What are the expected phenotypes and phenotypic ratios in the F 1 and F 2? [Apakah fenotip dan nisbah fenotip dalam F 1 dan F 2?] What type of epistatic interaction is involved? [Jenis epistasis manakah yang terlibat?] (2 marks / 2 markah) [c] Another set of alleles R and r which are also independently inherited determine the color pattern of the bulb, R will give full color and r will give spotted colored bulbs. If the true breeding full colored variety were homozygous for R, and the white ones homozygous for r, what would the phenotypic ratio in the F 2 of the above cross be? [Satu set alel R dan r yang juga diwariskan secara berasingan menentukan pola warna biji bawang, di mana R memberi warna penuh dan r memberikan warna berbintik. Sekiranya jenis berwarna membiak tulen di atas adalah homozigus untuk R, dan yang putih adalah homozigus untuk r, apakah nisbah fenotip dalam F 2 untuk kacukan di atas?] (10 marks / 10 markah)...4/-

- 4-4. [a] Random genetic drift is one of the processes that violate the assumption on Hardy-Weinberg allele frequency model. Explain random genetic drift. [Hanyutan genetik rawak merupakan salah satu proses yang melanggar andaian model frekuensi alel Hardy-Weinburg. Terangkan hanyutan genetik rawak.] Explain F IS, F IT and F ST. [Terangkan maksud F IS, F IT dan F ST. ] [c] Explain Wahlund effects. [Huraikan kesan Wahlund.] 5. [a] In quantitative genetics, total phenotypic variance can be written as: VP = VA + VD + VI + VE + VGE. Explain what are VA, VD, VI, VE and VGE. Briefly describe how knowledge gained from measuring genetic and environmental variances can be used to improve yield in a crop plant. [Dalam genetik kuantitatif, jumlah varians fenotip boleh ditulis sebagai : VP = VA + VD + VI + VE + VGE. Terangkan apa yang dimaksudkan dengan VA, VD, VI, VE dan VGE. Huraikan dengan ringkas bagaimana pengetahuan yang diperolehi daripada pengukuran varians genetik dan persekitaran dapat digunakan untuk meningkatkan hasil tanaman. ] (12 marks / 12 markah) Using an example, explain what is meant by genotype-byenvironment interaction. [Dengan menggunakan contoh, terangkan maksud interaksi genotip-oleh-persekitaran.]...5/-

- 5-6. [a] Design an experiment in which a genetic linkage map can be constructed for 3 genes. [Rekabentukkan satu eksperimen untuk membina peta untaian gen melibatkan 3 gen.] (14 marks / 14 markah) Explain maternal inheritance and the difference between maternal inheritance and nuclear inheritance. [Terangkan pewarisan maternal dan perbezaan antara pewarisan maternal dan pewarisan nukleus.] - ooooooo -