Using modern techniques of sequencing by synthesis and the shotgun approach, sequences are assembled into chromosomes by ________.

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#Question id: 15150

#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 recessive mutations in both genes, the F1 progeny shows will have red eye, what is the expected phenotypic ratio of red to white eyed insects in the F2.

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#Question id: 15418

#Unit 5. Developmental Biology

In which type of interaction, the responding tissue has already been specified and needs only an environment that allows the expression of particular traits?

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#Question id: 11452

#Unit 7. System Physiology – Animal

A given photon of light may trigger an action potential with thousands of times more energy because the signal strength is amplified by ________.

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#Question id: 4129

#Unit 3. Fundamental Processes

Which of the following statements about the tRNA that normally accepts phenylalanine is false?  (mRNA codons for phenylalanine are UUU and UUC.)

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#Question id: 54

#Unit 1. Molecules and their Interaction Relevant to Biology

About 25 of the 92 natural elements are known to be essential to life. Which 4 of these 25 elements make up approximately 96% of living matter?