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A dominant gene V in humans causes certain areas of the skin to become depigmented, a condition called "vitiligo." Albinism is the complete lack of pigment production and is produced by the recessive genotype aa. The albino locus is epistatic to the vitiligo locus. Another gene locus, the action of which is independent of the previously mentioned loci, is known to be involved in a mildly anemic condition called "thalassemia." (a) When the adult progeny from parents both of whom exhibit vitiligo and a mild anemia is examined, the following phenotypic proportions are observed : 1/16 normal : 3/16 vitiligo : 1/8 mildly anemic : 1/12 albino : 3/8 vitiligo and mildly anemic : 1/6 albino and mildly anemic. What is the mode of genetic action of the gene for thalassemia? (b) What percentage of the viable albino offspring in part (a) would carry the gene for vitiligo? (c) What percentage of viable offspring with symptoms of mild anemia also show vitiligo?
The gene for sickle-cell anemia exhibits heterozygote advantage. An individual who is an HB-A/HB-s heterozygote has increased resistance to malaria and therefore has greater fitness than the HB-A/HB-A homozygote, who is susceptivle to malaria, and..
Compute the allelic and genotypic frequencies for the disease assuming Hardy?Weinberg equilibrium. Show your work and express your answer to three significant figures.
A couple has 4 children. Neither the father nor the mother is bald; one of the two sons is bald, but neither of the daughters is bald. If one of the daughters marries a non bald man and they have a son, what is the possibility that the son will becom..
Carlo is a microbiologist who detected viral genes integrated into bacteria and found that the viral genes were reproduced each time a bacterium divided. What kind of infection is he witnessing?
Polio and HIV are both +ssRNA viruses have very different strategies for replicating their genomes. After the viral genomes enter the cell, explain the first step involved in replication of each genome.
What will be appearance of the offspring of a cross of the F1 peaches back to that smooth,oval glanded parent. How several diploid Drosophila cells would be needed to have 1 picomole of each allele.
Which category of organisms is responsible for fixing the world's supply of carbon?
Rotavirus grows in cells at the tips of intestinal villi and causes gastroenteritis. Abrupt onset of vomiting and diarrhea occurs 1 to 3 days after the virus is contracted and lasts 3 days. Use the lytic cycle to explain the disease pattern.
Hospital patients often become infected with resistant bacteria that are rarely found outside of the hospital environment. How can you explain this observation?
In a type of parakeet known as a "budgie", feather color is controlled by two genes. A yellow pigment is synthesized under control of a dominant allele Y.
What trends would they have noticed in Earth's terrestrial vegetation over this period.
Using the understanding of osmosis describe, why putting salt on a pork chop before cooking it on a grill is probable to result in a dry tough piece of meat.
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