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.
what is lactose tolerance,enzyme lactase,chromosome,dairy products,infancy,digestion
- ID: 15953
- Source: DNALC.DNAi
15396. Chromosome 2: the gene for lactase, Matt Ridley
Matt Ridley talks about chromosome 2, the gene for lactase.
15271. Discovering the lac operon, François Jacob
François Jacob talks about bacterial mutants that could not metabolize lactose. Using these mutants, Jacob and Monod figured out how protein production is controlled.
16688. Animation 33: Genes can be turned on and off.
Jacques Monod and François Jacob work with how bacteria breaks large sugars into smaller pieces.
15272. The molecular biology of the lac operon, Fraois Jacob
François Jacob talks about the relationship between DNA, ribosomes, and protein production.
15269. The discovery of the lac operon, François Jacob
François Jacob talks about how enzyme production was viewed at the time they were beginning their experiments.
15488. Restriction digest, 3D animation with no audio
Restriction enzymes can bind to and cut DNA at specific sites.
16552. Animation 25: Some viruses store genetic information in RNA.
David Baltimore and Howard Temin explain work on the Rous sarcoma virus.
15268. Designing bacteria, François Jacob
François Jacob talks about designing bacteria.
15253. Discovering the lac operon, Walter Gilbert
Walter Gilbert talks about identifying the lac operon repressor.
16703. Problem 33: Genes can be turned on and off.
Learn more about the lac operon system.