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A man makes 0 units of an enzyme due to homozygous recessive genes on chromosome 21. His wife makes 100 units of the enzyme due to a heterozygous pair of genes on chromosome 21. They have a son with trisomy 21 who makes 200 units of the enzyme.
a. In which parent did the nondisjunction occur?
b. Did the nondisjunction occur in meiosis I or meiosis II (explain your answer)?
Cross between pure red tomato and yellow tomato made all red F1 progeny. From the F2 progeny of 400 plants, 90 were yellow. Hypothesize that a single pair of allele is involved such that Y- = Red and yy = Yellow. Test this hypothesis using Chi squ..
1ml of potato extract, 2ml of 5mM dopa (3,4-dihydroxyphenyalanine), 0.5ml of 20mM citrate buffer, 0.5ml of 1% hydroquinone and 2ml distilled water.
Give a mechanistic explanation for finding which is consistent with all the data. Explain your reasoning
Why do precapillary sphincters wrap aroung the root of each capillary where it leaves the metarteriole? Why do vessels branch to form capillary beds?
With the help of sire directed mutagenesis, hemoglobin has been created in which the proximal histidine residues in both alpha and beta subunits have been replaced by glycine.
Estimate what type of bond joins one strand of a DNA duplex to the other strand and what term is used to describe the pattern of base pairing between one DNA strand and its partner in a duplex?
Describe what are the three different microbial groups in anaerobic digester, and how they work together to convert complex polymers to methane gas
Assume you have 10ml of a concentrated solution of dye and you want to prepare a 1/3, 1/9, and 1/27 dilution so that you have at least 5 ml of each solution to work with when you are all done.
Transcranial magnetic stimulation (TMS) is a noninvasive technique used to stimulate regions of the human brain. A small coil is placed on the scalp, and a brief burst of current in the coil produces a rapidly changing magnetic field inside the br..
What are some reasons for reestablishing wolves in Yellowstone National Park? What effects might the reintroduction of wolves have on the ecological communities in the region? What might be completed to mitigate the conflicts between ranchers and wol..
Selective pressure is often thought to occur within the coding region of a gene but when the sum of Ka/Ks for each position is calculated, no positive selection is shown. Why is this? Can you think of a way to show positive selection in such a gen..
A new dominant mutation occurs in a population of red-winged blackbirds that triples the size of the red shoulder patch in males. Individuals expressing the new mutation are far more conspicuous to predators and this causes their survival to be re..
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