genetics multiple choice answer check 6. Which of the following describes the me

Question

genetics multiple choice answer check

6. Which of the following describes the mechanism of DNA replication determined by Meselson and Stahl? A. Rolling circle B. Theta C. Conservative Semi-conservative E. Dispersive 7. Which type of mutation leads to changes that only affect the individual n whom the mutation occurred? A. Forward B. Reverse Somatic Germ-line E. Neutral 10, which disease is the major reason for mental retardation in boys and is due to an expanding trinucleotide repeat. A. Down syndrome B. Huntington disease C. Patau syndrome D. Cockayne syndrome FE. Fragile X syndrome 11. In the three types of post-replication repair mechanisms (mismatch, base excision and nucleotide excision), which enzyme(s) are used in all three types of repair A. DNA glycoslase B. DNA polymerase C. DNA photolyase D. A and B

Explanation / Answer

6.ans. Semi-conservative.

Meselson and Stahl experiment proved that the replication of DNA is Semi-Conservative where after the replication process daughter have DNA with one strand is parent DNA and another is newly synthesized. in this experiment they used radioactive compound N15 to observe the Replication process.

7Ans.Somatic.

if mutation occurs in the somatic cell that only effect the individual in whom the mutation occured. if the mutation occured in Germ-line that effects the next generation individuals.

8.Ans.

9.Ans.Huntingtons disease.

it is a disease where death of the brain cells will occur. it is a common inherited disease and this is caused by Autosomal dominant mutation. the symptoms are behavioral problems affecting movement, memory and mental abilities. symptoms begins at the age of 30 to 50s.

10.Ans.Fragile X-syndrome.

it is the condition where more males are affected than female. in Fragile X-syndrome trinucleotide repeats called CGG repeats with in the FMR1 gene on the X-chromosome results fail to express Fragile X mental Retardation Protein, it is the protein found high concentration in testes and brain.

11.Ans.DNA polymerase

12.Ans.male with trisomy

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