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Ahs2201:Genetics And Cytogenetics Question Paper

Ahs2201:Genetics And Cytogenetics

Course:Bachelor Of Horticulture

Institution: Meru University Of Science And Technology question papers

Exam Year:2012

QUESTION ONE – 30 MARKS
(a) State the two Mendelian Laws. (4Marks) (b) (i) What is a Phenotype? (2Marks) (ii) What are the three factors which affects the phenotype of an organism? (3Marks) (c) What are the Four factors which are responsible for non-mendelion inheritance ratios? (d) Draw a Deoxyribose sugar molecule. (5Marks) (e) (i) What is a transfer RNA. (2Marks) (ii) Draw a well labelled structure of a transfer RNA. (6Marks) (f) Duplication is one method used for causing Chromosome alterations. Explain how duplication works and its significance. (4Marks)
QUESTION TWO – 20 MARKS
(a) What is Polyploidy (3Marks) (b) Give three reasons why polyploidy is not common in animals. (3Marks) (c) State three sources of polyploidy. (3Marks) (d) Explain how crossing-over takes place and its importance. (6Marks) (e) Define the following terms: (i) Polygenes (1 Mark) (ii) Modifying genes (2 Marks) (iii) Additive gene action (2 Marks)
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QUESTION THREE – 20 MARKS
(a) (i) Using a graph, explain how the Hardy-Weinberg equation works in random mating in a
given population. (7Marks)
(ii) State and explain all the factors which cause changes in gene frequency. (8Marks)
(b) (i) What is chromosome mapping? (2 Marks) (ii) State the importance of chromosome mapping. (3Marks)
QUESTION FOUR – 20 MARKS
Below is a single strand of the DNA
A A G C T T C C C G C A T G C T A A AG G T
(i) Draw a complementary mRNA strand formed. (3Marks) (ii) Using the genetic code table, draw a polypeptide chain dictated by this DNA strand. (6Marks) (iii)State any three differences between RNA and DNA. (3Marks) (iv) Explain the procedure of protein synthesis involving both transcription and translation. (5Marks)
QUESTION FIVE – 20 MARKS
(a) State any three differences between Mitosis and Meiosis. (6Marks) (b) What is qualitative inheritance? (3Marks) (c) Give three differences between Quantitative and Qualitative inheritance. (6Marks) (d) (i) What is gene linkage? (2Marks) (ii) Explain the importance of linkage in the study of genetics. (3Marks)

Ahs2201:Genetics And Cytogenetics Question Paper

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