Bio 203 Exam Final 2-15-07 USED with answers

Bio 203 Exam Final 2-15-07 USED with answers - Bio. 203 1...

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Bio. 203 1 Hour Exam ID No: ---------------------------------------------------------- February 19, 2007 Lab Room No.------------------------------------------------------------ 1. In an organism with 52 chromosomes, how many tetrads would be expected to form during meiosis? A. 52 B. 26 C. 13 D. 104 E. 208 Answer: B 2. In a healthy male, how many sperm cells would be expected to be formed from (a) 400 primary spermatocytes? (b) 400 secondary spermatocytes? A. (a) 800 (b) 800 B. (a) 1600 (b) 1600 C. (a) 1600 (b) 800 D. (a) 400 (b) 400 E. (a) 100 (b) 800 Answer: C 3. In tigers, a recessive allele causes a white tiger (virtual absence of fur pigmentation). In the mating of two phenotypically normal tigers, which produced a white offspring , what percentage of their offspring are expected to be white? A. 50% B. 75% C. about 66% D. about 90% E. 25% Answer: E 4. A man was born with six fingers on each hand. His wife and their first son have a normal number of digits. Having extra digits is a dominant trait. The couple's second child has extra digits. What is the probability that their next (third) child will have extra digits? A. 1/2 B. 1/16 C. 1/8 D. 3/4 E. 9/16
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Answer: A 5. What types of phenotypic ratios are likely to occur in crosses between two pea plants, which differ at a single locus for flower color? A. 9:3:3:1, 1:2:1 B. 1:1:1:1, 1:4:6:4:1 C. 3:1, 1:1, 1:2:1 D. 9:7, 12:3:1 E. 15:1, 1:2 Answer: C 6. How many different types of gametes can be formed by individuals with genotype AaBbcc ? A. AaBbcc B. ABc, Abc C. ABc, Abc, aBc D. ABc, Abc, aBc, abc E. Non of the above Answer d 7 . Two organisms, AABBCCDD and aabbccdd , are mated to produce an F1 that is self- fertilized. If the capital letters represent dominant independently assorting alleles, how many different genotypes will occur in the F2? A 64 B 81 C 4 D 16 E Non of the above Answer b 8. A condition, in which one gene pair masks the expression of a non-allelic gene pair, is called_____. A. codominance B. epistasis C. dominance D. recessiveness E. additive alleles
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Answer: B 9. In a family with two children, the boy has a blood type A, while the girl is born with B blood type. Mother has a blood type AB. What are the possible blood types of father? A AB B O C A D B E All of the above. Answer E 10. When two genes fail to assort independently, the term normally applied is _________. A. discontinuous inheritance B. Mendelian inheritance C. linkage D. tetrad analysis E. dominance and/or recessiveness Answer: C 11. Assume that a cross is made between AaBb and aabb plants and all the offspring are either AaBb or aabb . These results are consistent with the following circumstance: A. complete linkage. B.
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Bio 203 Exam Final 2-15-07 USED with answers - Bio. 203 1...

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