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In some plants, a red pigment, cyanidin, is synthesized from a colorless precursor. The addition of a hydroxyl group (-OH) to the canidin molecule causes it to become purple. In a cross between two randomly selected purple plants, the following results are obtained: 94 purple: 31 red: 43 colorless.
How many genes are involved in determining these flower colors? Which genotypic combinations produce which phenotypes?
An enzyme is discovered that selectively shortens telomeres. Its gene is isolated, cloned and transfected into a malignant cell line where it is transcribed and translated.
If narrow-sense heritability in the rabbit population is 0.7, what is an expected body weight among offspring of selected rabbits. What was the amount of cash paid on accounts payable for the period of the year ended December 31.
For seedless vascular plants create a homosporous and heterosporous life cycle of a plant. Also label what structures are haploid and which are diploid as well as when meiosis and fertilization occur.
In a prokaryotic cell, where would you expect to find enzymes that break down cellulose?
Discuss the different phases of the cell cycle. At which part of the cell cycle would you expect that a change in regulation could result in cancer? How is the cancer cell cycle different from a normal cell cycle? Provide a rationale for your answer.
Knowing that a plant will grow from a single cell in tissue culture, how could you transform a plant so that it glows in the dark?
Assume i f you are performing in-situ hybridization to detect mRNA, why do you use the antisense strand? Are you using RNA or DNA as a probe for mRNA?
the reversion precisely reversed the original change that produced the typ- mutant allele.
Lost supplies for the and not enough time before due date to start now takes seven days of observation, does anyone have this data?
What sorts of plants will you select for crossing. Describe how allergies, common cold or influenza change the structures of the respiratory system and cause decrease in gas exchange.
List another common type of bias that can takes place in this type of study. Is it likely to have influenced the results here? Explain your reasoning briefly.
If coliforms are found in a water sample, the IMViC test will help determine whether the coliforms are of fecal origin and not from plants or soil. What IMViC results would indicate the presence of fecal coliforms?
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