The release of neurotransmitter at a chemical synapse in the central nervous system is dependent upon which of the following?

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#Question id: 15153

#SCPH12 I Genetics

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 parallel with recessive 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.

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#Question id: 4943

#SCPH28 | Zoology

In what way were conditions on the early Earth of more than 3 billion years ago different from those on todayʹs Earth?

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#Question id: 5207

#SCPH28 | Zoology

Why is it unwise to try to relate an organismʹs complexity with its size or number of cells?

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#Question id: 4368

#SCPH28 | Zoology

Which statement is false concerning the general transcription factor, TFIID?

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#Question id: 2119

#SCPH06 I Botany

A sodium-potassium pump: