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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.
Suppose you have been assigned to test the effectiveness of drug X in preventing the growth of certain types of cancerous cells. your responsibilities include designing and executing the experimental approach.
Assume you are a scientist at a genetic testing company. Describe how you would take one approach to testing relatedness between two individuals,
In order for multicellular organisms to develop properly and maintain homeostasis, the cells must be able to communicate with each other so that their responses are appropriate and coordinated.
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At 45C, the vapor pressure of water for a glucose solution in which the mole fraction of glucose is 0.080 is 65.76 mmHG. Calculate the activity and activity coefficient of the water in the solution.
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As you have learned in the readings, extinction is a natural selection process. You have also read that humans are often responsible for accelerating this procedure.
Choose a part of any of the Central, Peripheral and Autonomic Nervous systems that interest you. Further research the part, its function, and any disorders that affect the part on the internet.
A farmer planted a field of BT 123 corn and wants to estimate the yield in terms of bushels per acre. He counts 35 ears in 1/1000 of an acre. He determines that each ear has about 500 kernels on average. He also knows that a bushel contains about 97,..
Create a simple diagram of the N cycle in a watershed using boxes and arrows; no need for numbers and do not forget to include important pools and fluxes.
A body was discovered and diagnosed as having died due to oxygen deprivation. Explain why the toxicology tests included a test for cyanide poisoning.
During development, the formation of the fingers and toes of the fetus requires the removal, by apoptosis, of the tissue between them.
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