17. Which of the following is NOT a term used to describe a process that results
ID: 140015 • Letter: 1
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17. Which of the following is NOT a term used to describe a process that results in abnormal chromosomal structure? A. Duplication B. Freezing C. Translocation D. Deletion 18. Which of the following genetic disorders results in severe mental retardation caused by a deletion of part of a chromosome? A. Huntington disease B. Cri du chat syndrome C. Prader-Willi syndrome D. Cystic fibrosis 19. The most serious problem associated with the inversion of genetic material is: A. severe mental retardation in the affected individual. B. physical disabilities. C. chromosomal defects in offspring. D. infertility. 20· The outward manifestation of a disease, often influenced by both genes and the environment, is called the disease: A. genotype. B. allele. C. phenotype. D. dominance. 21. An individual who is heterozygous for a gene has: A. alleles at a given locus that are different from one another B. alleles at a given locus that are the same. C. alleles at different loci that are the same. D. a recessive gene on chromosomal pairs. A couple is planning to have children. The father is affected by an autosomal dominant disease, but the mother does not have the disease gene. If the father is a heterozygote, what is the chance that their first child will be affected by the autosomal dominant disease? A, 10096 B. 75% C. 50% D. 2596 22. 23. Which of the following is generally true of an autosomal recessive pedigree? A. On average, 50% of the children will have the autosomal recessive disease if one parent has the disease. B. Males are affected more than females. C. On average, 25% of the children are affected by the autosomal recessive disease if both parents are carriers. D. There is a decreased risk of disease with consanguinity.Explanation / Answer
17)B-The term freezing does not describe a process that results in abnormal chromosome structure.
18)B-Cry-du-chat syndrome is due to deletion of 5P part of chromosome and it causes mental retardation
19)A-Most serious problem assosiated with inversion of genetic material is that it causes severe mental retardation.
20)C-Outward manifestation of a gene influenced by both gene and environment is called phenotype.It is the external appearance of a plant.
21)A-Heterozygous individual for a gene means alleles at given locus that are
from one another.
22)C-There is only 50% chance of the offspring to get affected by disease.
Genotype of father-Hh(diseased)
Genotype of mother-hh
So offspring can be of Hh or hh.Therefore 50% chances.
23)C-In autosomal recessive pedigree there are 25% children that are affected if both parents are carrier.Moreove chances increase with consanguinity.
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