What is lactose tolerance / intolerance?
This gene on chromosome 2 codes for the enzyme lactase. This enzyme enables infants to break down lactose, the main sugar in milk. In people who are lactose tolerant, the gene remains active throughout their lives. In most people who are lactose intolerant, the gene is turned off after infancy, making the digestion of dairy products difficult and painful.
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- ID: 15953
- Source: DNALC.DNAi
Matt Ridley talks about chromosome 2, the gene for lactase.
François Jacob talks about bacterial mutants that could not metabolize lactose. Using these mutants, Jacob and Monod figured out how protein production is controlled.
Jacques Monod and François Jacob work with how bacteria breaks large sugars into smaller pieces.
François Jacob talks about the relationship between DNA, ribosomes, and protein production.
François Jacob talks about how enzyme production was viewed at the time they were beginning their experiments.
Restriction enzymes can bind to and cut DNA at specific sites.
David Baltimore and Howard Temin explain work on the Rous sarcoma virus.
François Jacob talks about designing bacteria.
Walter Gilbert talks about identifying the lac operon repressor.
Learn more about the lac operon system.