Table 1 shows three students’ examínation answers to a question that required a definition of the term, ‘mutation’. One student wrote a correct answer, whereas the other two did not. Choose the correct definition and explain why one other definition is not correct.
Table 1
Student |
Student’s definition of ‘mutation’ |
Aamir |
“A change in a gene to adapt to changes in the environment” |
Beatrice |
“A random copying error in the DNA base sequence” |
Charlie |
“An adaptation that causes variation within a species” |
Place a tick (☑) in the correct box to identify the phase of the cell cycle when most mutations occur.
⃞ Prophase
⃞ Metaphase
⃞ Interphase
⃞ Cytokinesis
The DNA triplet TGA eventually codes for the amino acid threonine. A base substitution mutation alters that triplet to TGT, which also codes for threonine. Predict and explain the effect of this mutation on the phenotype of the organism it occurred in.
Name the property of the genetic code illustrated in part c).
Did this page help you?