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Ch. 20 - The Molecular Revolution: Biotechnology, Genomics, and New Frontiers
Freeman - Biological Science 8th Edition
Freeman8th EditionBiological ScienceISBN: 9780138276263당신이 사용하는 게 아니라요?교과서 변경
모든 교과서Freeman 8th EditionCh. 20 - The Molecular Revolution: Biotechnology, Genomics, and New Frontiers문제 7
20장, 문제 7

Gene density is the number of genes per million base pairs (Mbp). Using Figure 20.5b, find the approximate number of genes estimated in water fleas and in humans, and note the size of each genome. Calculate the gene density in water fleas relative to that in humans.
Scatter plot showing genome size vs. estimated gene count for eukaryotes, highlighting water flea and human data points.

검증된 단계별 안내
1
Step 1: First, you need to identify the number of genes and the size of the genome in both water fleas and humans from Figure 20.5b. The number of genes is usually given in thousands and the size of the genome in million base pairs (Mbp).
Step 2: Next, calculate the gene density for each organism. Gene density is calculated by dividing the number of genes by the size of the genome (in Mbp). So, if for example, water fleas have 31,000 genes and a genome size of 200 Mbp, the gene density would be 31,000/200 = 155 genes/Mbp.
Step 3: Similarly, calculate the gene density for humans. If humans have 20,500 genes and a genome size of 3,200 Mbp, the gene density would be 20,500/3,200 = 6.4 genes/Mbp.
Step 4: To find the gene density of water fleas relative to that in humans, divide the gene density of water fleas by the gene density of humans. Using the example numbers, this would be 155/6.4 = 24.2.
Step 5: Interpret your results. In this example, the gene density in water fleas is approximately 24 times greater than that in humans. This means that there are more genes per million base pairs in the genome of water fleas compared to humans.

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주요 개념

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Gene Density

Gene density refers to the number of genes present per million base pairs (Mbp) in a genome. It provides insight into how densely packed genes are within the DNA, which can vary significantly between different organisms. Understanding gene density helps in comparing the complexity and functionality of genomes across species.
추천 영상:
05:43
Density of Liquid Water vs. Solid Ice

Genome Size

Genome size is the total amount of DNA contained within one copy of a genome, usually measured in base pairs or megabase pairs (Mbp). It is a crucial factor in determining gene density, as larger genomes may have more non-coding regions, affecting the number of genes per unit of DNA. Comparing genome sizes helps in understanding evolutionary and functional differences between species.
추천 영상:
05:30
Genomes and Genome Evolution

Comparative Genomics

Comparative genomics involves analyzing and comparing the genomes of different species to understand their evolutionary relationships and functional differences. By comparing gene density and genome size, researchers can infer how genetic complexity and organization vary among organisms, providing insights into their biology and adaptation strategies.
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05:30
Genomes and Genome Evolution
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