the accumulation of tiny genetic changes could account for the vast
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Globin genes have evolved by Sequence evolution via point mutations in genes Tandem duplications of genes Fusion of exons of a gene Translocation of a gene copy to a new chromosome All of the above mechanisms have contributed to globin gene evolution Microsatellite sequences are Very short Highly variable Common in mammalian genomes Useful for identification of specific individuals All of the above statements are true What approximate proportion of the human genome consists of coding regions? 1% 5% 25% 60% 80% In comparing different species, as the size of the genome increases The percentages of different types of genes do not change The percentage of unique genes increases The percentage of gene families with between 2 and 4 members decreases The percentage of gene families with more than 4 members decreases The percentage of genes in gene families increases and the proportion of unique genes decreases The minimum number of genes for a eukaryotic organism is about 500 1500 5000 10000 15000 Messenger RNAs that are expressed at low levels in a particular cell type Are the transcripts of luxury genes Are coded by only a small proportion of the total number of expressed genes in the cell Are more likely to be expressed in many other cell types than highly expressed mRNAs Tend to code for specialized proteins Represent only a small proportion of the total mRNAs In the human genome, tandem repeats are commonly found In intergenic regions In "desert" (gene-free) regions of chromosomes In introns In centromeres and telomeres In coding regions Which type of organism has the smallest number of genes? Parasitic bacteria Free-living bacteria Unicellular eukaryotes Plants Mammals Which of the following methods can be used to map a genome? Determining recombination frequencies between gene loci Digesting DNA molecules with restriction endonucleases and determining the nucleotide distances between restriction sites Sequencing the DNA molecules of chromosomes, identifying the genes in the sequence, and measuring the nucleotide distances between them Measuring recombination frequencies between genetic markers, such as restriction sites All of the above methods can be used to map a genome The chloroplast genome codes for Thirty or more tRNAs For rRNAs Proteins involved in protein synthesis RNA polymerase The chloroplast genome codes for all of these
Sri K.
Complete each sentence with the appropriate term or phrase. 50 million silent rare 5.6 million affect DNA markers polymorphisms 1.1 million do not affect RefSeq missense common wild-type Sequencing of human genomes has revealed that there are many differences between individuals. These differences are called Comparison of only three genomes with the reveals over polymorphisms in the human genome. Over single nucleotide polymorphisms have been identified by comparing many human genomes. Some polymorphisms are, indicating that they occurred early in the history of humans. Others are, suggesting that they arose recently. The presence of so many DNA polymorphisms indicates that a human genome does not exist. Most DNA polymorphisms phenotype because they are located outside of coding regions or are mutations. DNA polymorphisms can be used as signposts, or, that can help locate nearby disease-causing mutations. Reset
Mutations and Genetic Changes
Madhur L.
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