final exam practice test

final exam practice test - BIOL 1020 Principles of Biology...

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BIOL 1020: Principles of Biology FINAL EXAM Fall 2005 1. An organism with the genotype of AaBb (A and B are on different chromosomes) can produce _____different types of gametes? A. 8 B. 4 C. 2 D. 6 2. An organism with a dominant phenotype is crossed with a homozygous recessive organism. None of 100 offspring are homozygous recessive. The genotype of the dominant parent is: 3. People expressing the cystic fibrosis trait are ___________ for the disease gene. 4. An unaffected couple (neither father nor mother have the disease) has two hemophilic sons and two normal daughters. This is because 5. Down's syndrome is caused by A. an extra copy of chromosome # 4 in most cases. B. an extra copy of chromosome # 21 in most cases. C. loss of one of the chromosome # 21. D. errors in mating behavior. 6. An allele is a(n) 7. In the absence of crossing over between the genes (A and B) on the same chromosome, a parent with AaBb genotype can produce _________ different kinds of gametes. 8. If the phenotypic ratio among offspring in a cross is 1(Tall) : 1 (Short), the genotypes of the two parents is: 9. Which condition results from a nondisjunction (irregular separation) involving the sex chromosome? A. Down B. Edwards C. Patau D. Turner 10. A male human with BARR body indicates that this person has _____________________. 11. Jack has type AB blood. His father was type A and his mother was type B. Jill is type B. Her father was type AB, and her mother was type B. What possible offspring (in relation to blood type) could Jack and Jill have? 12. The frequency of crossing-over between two genes on the same chromosome: 13. Turner’s syndrome is an example of ___________ A. trisomy B. monosomy C. polyploidy D. non of the above
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