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Unformatted text preview: BioS 115 Exam 2 Version A _______________________ Genetics October 25, 2010 Name Page 1 of 5 IMPORTANT: Mak e s ur e you hav e your s c an t ron . Wri t e t h e e xam v e r s ion (A , B , C) on t h e an s w e r c ard! Wri t e your nam e on t hi s s h ee t . Th e r e ar e 45 qu e st ion s on t h e e xam , wor t h a t o t al of 90 poin ts . Pl e a s e r e ad t h e qu e st ion s c ar e fully . Alway s c hoo s e t h e MOST CORRECT an s w e r . Mark an s w e r s on t h e e xam s h ee t F IRST . Wh e n you ar e c onfid e n t t ha t your an s w e r s ar e c orr ec t , mark t h e s c an t ron s h ee t u s ing a No . 2 p e n c il . Thi s st ra t e gy avoid s e ra s ur e s on t h e s c an t ron s h ee t . Bo t h t h e e xam and s c an t ron s h ee ts will b e c oll ec t e d . 1. The maximum recombination frequency between two genes is A) 100% B) 60% C) 50% D) 10% E) 1% 2. A phenotypically normal couple has a phenotypically normal daughter and a son who suffers from a X-linked, recessive disease with strong phenotype. What is the probability that the daughter is a carrier of the disease gene? A) 1/16 B) 1/8 C) 1/4 D) 1/2 E) 2/3 (applies to questions 3 and 4): Albinism is a total lack of skin pigment due to an autosomal, recessive gene. What is the probability of a couple having an albino child if: 3. She is albino, he is normally pigmented but his father was albino. A) 1/4 B) 1/2 C) 3/4 D) 1/3 E) 2/3 4. Both are normally pigmented as are their parents, but both have albino siblings. A) 1/2 B) 2/3 C) 3/4 D) 1/9 E) 2/9 5. The most common form of color blindness in human beings results from an X-linked recessive gene. A phenotypically normal couple has a normal daughter and a son who is color blind. What is the probability that the daughter is heterozygous? A) 1/8 B) 1/4 C) 1/2 D) 2/3 E) 3/4 _ (6) __ is the occasional failure of two chromosomes to separate from each other during meiosis. _ (7) __ is a human genetic disease caused by such an event involving the X chromosome. 6. A) nondisjunction B) polyploidy C) alloploidy D) dominance 7. A) albinism B) hemophilia C) alkaptonuria D) Klinefelter syndrome 8. A male with hypophosphatemic rickets marries a normal woman. They have 6 children (3 boys and 3 girls). All the boys are normal but all the females are affected. What type of inheritance does this suggest? A) X-linked dominant B) X-linked recessive C) autosomal D) Y-linked recessive E) Y-linked dominant 9. Assuming independent assortment, how many different gametes can be formed by an organism that is homozygous for 6 genes and heterozygous for 2?...
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This note was uploaded on 10/03/2011 for the course CHEM 31 taught by Professor Roberts during the Fall '10 term at Lehigh University .
- Fall '10