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Two genes combine to generate the phenotype of the comb of a rooster. The 4 possible phenotypes are walnut, rose, pea and single. Rose has an absolute requirement for the presence of the dominant allele R and pea has an absolute requirement for the presence of the dominant allele P. Some of the chickens below may carry the corresponding recessive alleles r and p in the heterozygous or homozygous from (the somatic cells of chickens are diploid). A walnut comb rooster is mated to three hens. Hen A is a walnut comb and has offspring in the ratio of 3 walnut to 1 rose. Hen B is a pea comb and has offspring in the ratio 3 walnut, 3 pea, 1 rose and 1 single comb. Hen C is a walnut comb and has only walnut comb offspring. What are the genotypes of the rooster and the 3 hens? The answers are Rooster = RrPp ; Hen A = RRPp; Hen B = rrPp; Hen C = RRPP. I just can't see how these answers came about. Any help will be truly appreciated.
Describe the steps of the nitrogen cycle. How is nitrogen lost from ecosystems? How is it replaced? Why does it need to be "fixed?"
Would you expect cancer to arise more often in types of cells that divide frequently (i.e. skin cells) or in types of cells that divide rarely or not at all
how the specificity of each codon could be determined.
In a 1973-74 situation comedy All in the Family, the character Archie Bunker says, Let me tell you something about beer, You can never buy beer, you can only rent it.
Read paper and give the summary of your results. Explain the main kinds of malaria (pathogen species), and explain the biology of disease process.
Describe how the clonal expansion theory explains the more rapid production of antigen specific antibodies, Helper T-cells and Cytotoxic T-cells, during a secondary infection.
20 year old student jason came into the student health center throughout finals complaining of a sore throat, general malaise, and low fever.
You are tasked with analyzing the transmission of a genetic disease through several generations. Males are indicated by square, females by circles.
gene expression is measured by the production of what molecule.
if 0.1 mL of 10^-2 dilution of a culture is placed out and 36 colonies appear after incubation, how many Cfu/mL were in the undiluted culture?
Determine when glucose is metabolized in the respirating celll to H2O and CO2, free energy change of the reaction is equal to that obtained when glucose is combusted with oxygen in a calorimeter chamber.
Explain how cells meet their energy requirements through the process of fermentation in absence of oxygen along with the examples.
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