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In fruit flies the gene (b) for black body is recessive to itsallele for gray. The gene (h) for hairy body is recessive for itsallele for wild type. A gray, wild-type female was crossed with ablack, hairy male. The f1 females were crossed to black, hairymales, and the following results were obtained: gray, wild-type:206; gray, hairy 198; black, wild-type 203; and black, hairy 205.Is linkage present? If so, what is the percent of crossingover?
Two protein kinases, PK1 and PK2, work sequentially in intracellular signaling pathway. You construct cells that contain inactivating mutations in the genes that encode either PK1 or PK2
Wild-type fruit flies, D. melanogaster, have dark red eyes. Recessive mutations in the X-linked white gene result in white eyes.
discuss the means of gas exchange for lophophora.
Develop a graphical representation of major evolutionary changes in invertebrates. Discuss the graphs as a class.
Let's assume for this problem that the world is divided into blue-eyed people and brown-eyed people. Let's also assume for the sake of simplicity that there is only one gene responsible for eye color and that the allele for brown eyes.
Draw a chain of 2 RNA nucleotides. Use R for the nitrogenous bases. Then, briefly explain why RNA is usually single-stranded and why it is less stable than DNA. Modify the drawing before to explain.
Discuss how much sample what sized aliquot is required to prepare 500 mL of a 1 to 100 dilution, and how much diluent would you need?
What will happen to resting membrane potential if potassiumsuccinate were injected into the intracellular environment (cytoplasm) of a neuron? Explain.
Discuss an example of how a daily human activity can be changed to change the environment for the better.
Observe under the microscope and choose about 25 cells.Determine the number of cells that are plasmolysed out of the 25 cells.The cells in which the protoplasm appears to have lost contact with the cell wall,even slightly,must be counted.
If cell surface receptors can rapidly signal to the nucleus by activating latent gene regulatory proteins.
How are virus particles assembled. Where do they get proteins for the nucleocapsid and proteins embedded in the envelope.
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