The same phenotype as the a/a;b/b progeny
Complementation tests are used to determine whether:
(select the one correct answer)
| A. |
a new mutant phenotype of interest is dominant or recessive to another mutant phenotype. |
| B. |
two phenotypically identical mutants carry mutations in the same or in different genes. |
| C. |
two or more mutants have the same sequence variation (the same DNA sequence) |
| D. |
b and c |
| E. |
a, b, and c |
| F. |
a and c |
If we are considering two genes that assort independently we would predict a 9:3:3:1 ratio with four different phenotypes in the F2 progeny created from crossing dihybrid F1s. If the a/a; B/_ progeny have the same phenotype as the a/a;b/b progeny what would the F2 phenotypic ratio be?
(choose one correct answer.) please explain!
| a. |
12:3:1 |
| b. |
10:6 |
| c. |
no change in the 9:3:3:1 ratio |
| d. |
13:3 |
| e. |
9:7 |
| f. |
9:3:4 |
What are some reasons why individuals with a dominant allele may not display the phenotype (or may display a weaker than expected phenotype, for example)?
(there may be more than one correct answer)
|
Other genes may affect expression or function of the gene causing the condition (e.g. “rescue” the mutant phenotype) |
|
Differences in the interference/regulation of transcription and translation |
|
Differences in the type/location of mutations within a gene |