BZ350S10Exam1

BZ350S10Exam1 - Name _ _ page 1 B/Z 350 1st Hour Exam Key...

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1 Name ________________________________________________________________________________ page B/Z 350 1st Hour Exam –Key Spring 2010 Answer all questions in the space provided on the exam. Questions 1-5 are worth 2 points each gene 1 . A ____ consists of a transcribed segment of DNA and control sequences associated with it. Epistasis___ __ 2. ____ is the masking of the action of one gene by the action of a non-allelic gene. suppression 3. In ____, a mutation of one gene reverses the effect of a mutation of a nonallelic gene. chromatids __ 4. One chromosome can consist of one or two ___. cohesin (complexes) 5 . During prophase of mitosis, ____ holds identical sister chromatids together throughout their length. Questions 6-13 are worth 5 points each. Explain your answers in full sentences, and show any math used. 6 . What is a reciprocal cross? In a reciprocal cross, the plant that acted as the male and contributed pollen (sperm cells) in the original (first) cross acts as the female and contributes eggs, and the plant that acted as the female and contributed eggs in the original (first) cross acts as the male and contributes pollen (sperm cells). 7. What is the difference between genotype and phenotype? Genotype is the genes an organism carries, while phenotype is the observable attributes (appearance) of the organism.
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2 Name ________________________________________________________________________________ page 8. Define codominance? Codominance is the situation in the heterozygous condition where both alleles of a gene are as completely expressed as the alleles are in the homozygous condition. 9. If the ratio of pea plants in the F 2 generation is really three tall pea plants to one short plant, what is the probability in a randomly selected sample of 8 F 2 plants that 3 of these will be tall and 5 of these will be short? An explanation is not necessary , just show your math and answer. P = 8!(3/4) 3 (1/4) 5 = 0.023 3!5! 10 . What is a type 1 (one) error in statistics? A type 1 error in statistics is throwing out a correct hypothesis because the data set falls outside the confidence limits. 11 . What is the relationship between length, number of base pairs, and picograms (pg) of DNA? One third of a meter of DNA consists of about 10 9 (one billion) base pairs of DNA and weighs about one picogram (pg = 10 -12 g).
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3 Name ________________________________________________________________________________ page 12 . What is the general name for a cell involved in meiosis? What are the names of cells in multicellular animals that are involved in meiosis? What are the names of
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This note was uploaded on 02/07/2011 for the course BZ 350 taught by Professor Stack/redi during the Spring '11 term at Colorado State.

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BZ350S10Exam1 - Name _ _ page 1 B/Z 350 1st Hour Exam Key...

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