A typical prokaryotic cell has about 3,000 genes in its DNA,...

Name: Problem 9, Chapter 1: Campbell Biology
Uploaded: 2021-01-28T21:04:01-08:00
Duration: 3 min 10 s
Channel: Michelle Jugovich
Description: A typical prokaryotic cell has about 3,000 genes in its DNA, while a human cell has about 21,300 genes. About 1,000 of these genes are present in both types of cells. Explain how such different organisms could have this same subset of 1,000 genes. What sorts of functions might these shared genes have?

A typical prokaryotic cell has about 3,000 genes in its DNA, while a human cell has about 21,300 genes. About 1,000 of these genes are present in both types of cells. Explain how such different organisms could have this same subset of 1,000 genes. What sorts of functions might these shared genes have?

Key Concepts

Evolutionary Conservation

Evolutionary conservation refers to the preservation of gene sequences and functions across different species over time due to their essential roles in cellular physiology. The presence of a shared gene subset in diverse organisms illustrates how these genes have been maintained through evolutionary pressures because of their critical functions.

Basic Cellular Processes

Basic cellular processes include the core biochemical activities necessary for life, such as protein synthesis, DNA replication, cell division, and metabolic pathways. These processes are fundamental to all cells, and so the genes encoding the key proteins involved are conserved across different forms of life.

Conserved Genes

These are genes that have remained relatively unchanged throughout evolution because they perform essential functions that are critical for the survival and maintenance of all living cells. Their conservation across vastly different organisms indicates that any significant change to these genes would likely impair vital cellular processes, thereby being negatively selected against.

Housekeeping Genes

Housekeeping genes are a subset of conserved genes that are involved in basic cellular functions required for cell viability and maintenance regardless of the cell type or organism. They manage fundamental processes like energy production, DNA replication, and cellular structure integrity, making them indispensable across a wide range of species.

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