Mutations in DNA occur in the genomes of most organisms, including humans. the m
ID: 78224 • Letter: M
Question
Mutations in DNA occur in the genomes of most organisms, including humans. the most important result of these mutations? a) They produce new genes for the individual. b) They produce new enzymes for the individual. c) They provide a source of new cells for the individual. d) They provide a fundamental source of genetic variation for future generations. e) They produce new chromosomes for future generations. Which of the following is a characteristics of mutations in DNA? a) They are usually expressed and result in positive changes for the individual. b) They are usually expressed and cause significant problems for the individual. c) Those that occur in the body cells of a parent are usually passed on to their children. d) They usually occur at very high rates in most genes. e) They result in different versions of a gene within the population. What is the relationship among genes, DNA, and chromosomes? a) Genes are composed of DNA and lie within chromosomes. b) Genes are separate entities from either DNA or chromosomes. c) Genes are found only in chromosomes and not DNA. d) Genes are found only in DNA and not chromosomes. e) Chromosomes are composed of genes but not DNA. What is the relationship between DNA and chromosomes in higher organisms? a) Chromosomes are found within DNA. b) DNA is found within chromosomes. c) There is no difference between DNA and chromosomes. d) DNA and chromosomes are completely separate structures. e) Chromosomes produce DNA. An individual is found to have a mutation in a gene associated with breast cancer. In which cells is this form of the gene located? a) Only in cells of the breast where cancer occurred. b) Only in cells of both breasts. c) Only in those cells found in females. d) Only in the cells of the breast and ovaries e) All the cells of the individual.Explanation / Answer
57 E)
mutations lead to different variations of the same gene in a population.
Since mutations alter genes, they lead to this genetic variation
58)A
genetic information is made of DNA na dthese genes are located on Chromosomes.
59) A
DNA is present within chromosomes
60) E
all the cells of the body contain the BRCA1 and BRCA2 genes, mutations of which cab cause breast cancer
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