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Question: The question is to detemine whether B-galactosidase is expressed under specified situations:Genotype Glucose only Lactose only Neither glucose nor lactoseI+ P+ O+ Z- / F' I- P+ Oc Z+ - + +
The answer indictes that the B-galactosidase is expressed whether lactose is present or not. I am confused because I thought that if an I- or Oc (both constituatives) were added to the cell on an F' then the inducibility is maintained. So I would have thought that the gene would only be expressed if lactose is present (incibility). My question is why is the gene expressed when lactose is not present?
Discuss how insertion, deletion, and base substitution of nucleotides can have a significant impact on genes. Find three specific examples of ways in which a very small change in DNA
Assume you have discovered that a single protein in two different cell lines is significantly overexpressed in one of them.
A male Drosphila melangaster is genotypically e^+/e^-, where e (ebony) is an autosomal gene. Of the four gametes produced by a single meiosis.
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Assume that r, red and sc, scarlet, are two recessive eye-color mutations that lie twenty map unites apart on the Drosphila X chromosome, and that each causes a read eye color in place of the wild type purple color.
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In analyzing a big sample of yeast colonies on a petri dish, a geneticist finds an abnormal looking colony that is very small. This small colony was crossed with wild type, and products of meiosis were spread on a plate to produce colonies.
The unfenced control plot had not changed significantly in species composition. By means of the concepts discussed in the chapter, what do you think happened.
Discuss how many molecules of histone 2A would be required in a typical human cell just after the completion of S phase, assuming an average nucleosome spacing of two hundred bp?
The A species of long day plant will flower when the days are over fourteen hours long. The plant is given a daily cycle of nine hours of light followed by three periods.
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