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#Question id: 11485
#Unit 7. System Physiology – Animal
In the odorant cells of mammals, specific odorants are detected by binding to _______
TLS Online TPP Program
#Question id: 6943
#Unit 5. Developmental Biology
The portion of the blastoderm-stage embryo which will give rise to most ectodermal, mesodermal, and endodermal tissues is called the:
TLS Online TPP Program
#Question id: 15151
#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 is made 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 series with a recessive mutation in one gene and a dominant mutation in the other, determine the phenotype of the F1 progeny and the expected phenotypic ratio of red to white eyed insects in the F2.
TLS Online TPP Program
#Question id: 19478
#Unit 12. Applied Biology
Cyt protein is a parasporal inclusion (crystal) protein from B. thuringiensis that exhibits
TLS Online TPP Program
#Question id: 16115
#Unit 7. System Physiology – Animal
Cold environmental temperatures: