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

Question

12. Please give answers with detailed explanations. preferentially done by hand or on computer. Need ASAP and will rate ASAP. 25. (3pts) The DNA primase in a cellis defective such that what way would this cell (first cell) differ from a second cell, identical to it but that uses A There would be no differences. t synthesizes a primer from DNA instead of RNA. In NA as a primer? B. This cell would complete the S-phase of the cell cycle sooner than the second cll C. The first cell would not be able to replicate its DNA. D. The first cell would accumulate mutations at a faster rate E. The first cell would not produce Okazaki fragments during replication sooner than the second cell. than the second cell. 26. A base substitution consequence of this mutation? has occurred in the origin of replication of an F plasmid. Which of the following is a likely A The plasmid will not be able to replicate. 8. The plasmid will not be able to insert into the bacteria's chromosome C. The bacterial cell will become an F. cell D. The bacteria will not be able to produce a sex pilus E. The bacteria will lose its resistance to an antibiotic. 27. (3 pts) Working in different laboratories, Mike, Helen, and Steve all punity independent Hfr strains of the same species of bacteria. They set out to map the relative positions of five genes, a-e, which are named after the order of their discovery, NOT their order on the chromosome. A mutant F plasmid has been generated that can integrate randomly and replicates in either direction, the location and orientation of the integration site will vary. All three use the same F strain and the same F-strain. Each of them allows their Hfr strain to mate with an F-strain and they note the phenotype of the F- strain after 20, 40, and 60 minutes F+ phenotype: a* bcd+e F- phenotype: a bt ce d e+ min a b c d+ e+ 40 min at b ct de e 60 min a+ b+ ct d+ e 20 min ab c+ d e* 40 min a b ct d e 60 min at b c de Mike's Hfr Helen's Hfr 40 0 mina b c+ d e+ Steve's Hfr 40min | a b c d e+ 60 min abc d+ e+ Based upon the data select the correct order of genes A d-b-c-ae d-a-e-b-c C d-b-e-a-c D. de-b-c-a d-oe-a-b

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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