10. Please give answers with detailed explanations. preferentially done by hand

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10. Please give answers with detailed explanations. preferentially done by hand or on computer. Need ASAP and will rate ASAP. 17. A point mutation occurs in the termination sequence of an eukaryotic only mutation present. What effect will this have on the polypeptide A. No effect B. gene that encodes a protein. This is the encoded by the gene B. Additional amino acids will be added to the carboxyl end of the polypeptide C. Extensive missense will occur at the carboxyl end of the polypeptide D. A shorter polypeptide will be produced due to premature termination of translation E. A single amino acid substitution at the carboxyl end is likely 18. In a particular bacterial cell a mutation has occurred in the gene encoding the CAP protein such that CAP can no longer bind cAMP. Which of the following conditions will result in the highest rate of transcription of the structural genes in the lac operon? A. high glucose, high lactose B. high glucose, low lactose C. low glucose, high lactose D. low glucose, low lactose E. A and C 19. A particular mRNA molecule is 1000 bases long but encodes a polypeptide that is 200 amino acids long. The mRNA is longer than what is necessary to encode the polypeptide due to A presence of introns B. presence of the promoter, which is not translated C. presence of control regions at the 5 and 3 ends D. the redundancy of the genetic code. E. both C and D 20. Alternative RNA splicing A is a mechanism for increasing the rate of transcription. B. can allow the production of structuraly and functionaly related proteins of different sizes from a single genetic locus C. can allow the production of similar proteins from different RNAs D. is a mechanism for executing crossing over during meiosis E. is vitally important for independent assortment of chromosomes 21. In Fred Griffith's experiments, R strain bacteria became S strain bacteria as a result of which of the following? 1. horizontal gene transfer 3. conjugation 4. transformation 5. genetic recombination A. 2 only B. 4 only C. 2 and 5 D. 1, 3, and 5 E. 1, 4, and 5

Explanation / Answer

the allele present are ;

C - curved hair ,dominant

C+ -recessive ,straight hair

H -spiraled hair - dominant

h -recessive of spiraled

a/a+ -lack of hair { seen at third locus }

1. phenotype of the female mosquito ;

the phenotype of the female will be curved hair which is a dominant allele ,located at the first locus of the gene .

2. Genotype of the male parent ;

c+/c+ ; h/h ; a/a+ ,

c+ represent the straight hair which is a recessive allele ,a no hair , h ,recessive spiraled hair

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