Koofer (2)

Koofer (2) - 1 Name:_ Last four digits of ID _ BIS 101 -...

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1 Name:______________________________ Last four digits of ID __________________ BIS 101 - 003 MIDTERM I October 16, 2009 READ THE FOLLOWING INSTRUCTIONS: Write your name legibly on each page of this exam. All work must be done in ink . Show all your work. Points will be subtracted for incorrect answers in multiple-choice questions. However, you will not get a negative total score for such a question. This exam is worth 100 points. You have 50 min. to complete the exam. Good Luck!
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2 Name:______________________________ P a g e : 3 ________ 4 ________ 5 ________ 6 ________ 7 ________ 8 ________ Total ________
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3 Name:________________________ (1) Holstein cattle are normally black and white. A superb black and white bull Charlie was purchased by a farmer for $100,000. All the progeny sired by Charlie were black and white. However, certain progeny, when interbred, produced red and white progeny at a frequency of about 25%. Charlie was soon removed from the stud list of Holstein cattle breeders. Explain why and write down genetic explanation of what went wrong with Charlie. (8 points) Charlie was heterozygous for the color gene, and hence likely for other genes making up the Holstein cattle. His presumed pedigree had to be questioned. B allele = black Bb (Charlie) x BB (many cows inseminated) b allele = red BB or Bb (Black progeny) Progeny interbreeding included Bb x Bb mating, which would produce red and white (bb) progeny in a 25% frequency. (2) Tay–Sachs disease (infantile amaurotic idiocy) is a rare human disease in which toxic substances accumulate in nerve cells. The recessive allele responsible for the disease is inherited in a simple Mendelian manner. A woman is planning to marry her first cousin, but the couple discover that their shared grandfather’s sister died in infancy of Tay–Sachs
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Koofer (2) - 1 Name:_ Last four digits of ID _ BIS 101 -...

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