20 You track a particular disease for three generations through your family and
ID: 212791 • Letter: 2
Question
20 You track a particular disease for three generations through your family and develop the pedigree shown above. This disease is likely a. A dominant allele disease . A recessive allele disease c. An incomplete dominance allele disease d. Controlled by too many genes to determine whether it is dominant or recessive 21. Full sickle-cell disease results from having Two recessive alleles b. Two dominant alleles c. One dominant and one recessive allele d. Two different genes e. Both B and D 22. Many traits in humans don't follow simple Mendelian geneties rules. This is because: a. The traits could be controlled by multiple genes b. There could be incomplete dominance c· There could be epistasis occurring d. There could be multiple phenotypic results from the same genotype e. All of the above are possibilitiesExplanation / Answer
20. The answer is a. A dominant allele disease
Because diseases of recesseive allele or incomplete dominance or controlled by too many genes occrus very rarely in the pedigree when compared with dominant allele disease.
21. The answer is a. Two recessieve alleles.
Sickle cell disease is autosomal recessieve disease.
22. The answer is e. All of the above are possibilities.
32. The answer is e. Both B and C are true. They have DNA and they have protein.
Hershey, Chase proved that DNA is genetic material by using P32 and S35 radioactive isotopes. As the phophorous is present in only DNA, to label the DNA they have used P32 and as the sulphur is present in protein, to lable the protein they have used S35. As they found P32 in the offspring, they have concluded that DNA is genetic material.
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