#Question id: 15155
#Unit 8. Inheritance Biology
In this problem we will explore some of the many ways that mutations in two different genes can interact to produce different Mendelian ratios. Consider a hypothetical insect species that has red eyes. Imagine mutations in two different unlinked genes that can, in certain combinations, block the formation of red eye pigment yielding mutants with white eyes. In principle, there are two different possible arrangements for two biochemical steps responsible for the formation of red eye pigment. The two genes might act in series such that a mutation in either gene would block the formation of red pigment. Alternatively, the two genes could act in parallel such that mutations in both genes would be required to block the formation of red pigment.
Further complexity arises from the possibility that mutations in either gene that lead to a block in enzymatic activity could be either dominant or recessive. If the crosses between a wild type insect with red eyes and a true breeding white eyed strain with mutations in both genes. Such considerations yield the Pathways in parallel with dominant mutations in both genes, determine the phenotype of the F1 progeny and the expected phenotypic ratio of red to white eyed insects in the F2.
#Question id: 10772
#Unit 8. Inheritance Biology
#Question id: 4871
#Unit 8. Inheritance Biology
In a testcross of an individual heterozygous for each of three linked genes, the most frequent classes of progeny were A B c/a b c and a b C/a b c, and the least frequent classes were A B C/a b c and a b c/a b c. what is the order of the genes?
#Question id: 2953
#Unit 2. Cellular Organization
If a cell in the G1 phase is fused with a cell in the S phase, then
#Question id: 4551
#Unit 3. Fundamental Processes
Various types of σ factor in column I, that are involved in several other function given in column II
|
I |
II |
|
I) σ70 |
a) Induced by unfolded proteins in the cytoplasm contain chaperones activity which refold unfolded proteins |
|
II) σs |
b) Genes involved in flagellum assembly |
|
III) σ32 |
c) Genes for nitrogen metabolism and other functions |
|
IV) σE |
d) Housekeeping genes, most genes in exponentially replicating cells |
|
V) σF |
e) Activated by unfolded proteins in the periplasmic space and cell membrane; genes encoding proteins that restore integrity to the cellular envelope |
|
VI) σ54 |
f) Stationary-phase genes and general stress response |
Which of the following combination is correct?