Variation in the traits of organisms may be attributable toa. gene mutations.b. alterations in chromosome structure.c. variation in chromosome number.d. all of the above
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Variation in the traits of organisms may be attributable to
a. gene mutations.
b. alterations in chromosome structure.
c. variation in chromosome number.
d. all of the above
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- Locus heterogeneity refers to a genetic disorder thata. has a heterogeneous phenotype.b. is caused by mutations in two or more different genes.c. involves a structural change in multiple chromosomes.d. is inherited from both parents.Which of the following may be detected using a karyotype?a. point mutationsb. a specific genetic markerc. an abnormal number of chromosomesd. the location of a transposonIn an organism’s genome, autosomes are a. the chromosomes that differ between the sexes. b. chromosomes that are involved in sex determination. c. only inherited from the mother (maternal inheritance). d. all of the chromosomes other than sex chromosomes
- Which of the following is correct regarding polytene chromosomes? options: A. Exposure to a sublethal dose of X-rays causes spontaneous mutations. B. Polytene chromosomes have been useful to observe specific bands correlated with individual genes. C. Both A and B D. None of the aboveLocus heterogeneity means that a genetic disordera. has a heterogeneous phenotype.b. is caused by mutations in two or more different genes.c. involves a structural change in multiple chromosomes.d. is inherited from both parentsGenetic linkage occurs becausea. genes that are on the same chromosome may affect thesame character.b. genes that are close together on the same chromosometend to be transmitted together to offspring.c. genes that are on different chromosomes are independentlyassorted.d. none of the above.
- Which of the following would not be consistent with the ideathat a disorder has a genetic component?a. The disorder is more likely to occur among an affectedperson’s relatives than in the general population.b. The disorder can spread to individuals sharing similarenvironments.c. The disorder tends to develop at a characteristic age.d. A correlation is observed between the disorder and amutant gene.Which of the following statements regarding the Y chromosome in mammals is TRUE?A. The Y chromosome is less than half the size of the X chromosome.B.Y chromosomes are most often present in egg cells and are not found in sperm cells. C.Most female mammals have one Y chromosome. D. The Y chromosome contains no protein-coding genes.Genes code for proteins that determine the phenotypes of individuals. Individualsinherit genes from parents.What is the relationship between genes and chromosomes?A Chromosomes are independent of genes.B Chromosomes are present inside genes.C Genes are made up of chromosomes.D Genes are present on chromosomes.
- When the chromosomes of closely related species are compared, a. the banding patterns are often similar. b. a few structural alterations may be seen. c. a change in chromosome number may be seen. d. all of the above are commonly observed.One of the forms of rickets is inherited in the autosomal dominant way. This disease is a result of: Select one: a. Aneuploidy. O b. Changes in the number of chromosomes. c. Chromosomal mutations. e. Gene mutations. O d. Polyploidy.A change in chromosome structure that does not involve a change in the total amount of genetic material is?a. a deletion. b. a duplication. c. an inversion.d. none of the above.