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Lactase

Any of a group of enzymes (trade name Lactaid) that hydrolyze lactose to glucose and galactose.The enzyme responsible for catalysing the split of lactose into galactose or glucose that is secreted in the intestine to breakdown foodstuff.


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Beneficial mutations vs harmful

... I'll try to give an example: most modern Europeans and their descendants have a mutation that causes them to fail to turn off the production of lactase enzyme after infancy. This was a harmful mutation if it happened to a stone age person, because their body would waste energy (even a tiny bit ...

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by biohazard
Tue Oct 08, 2013 12:39 pm
 
Forum: Evolution
Topic: Beneficial mutations vs harmful
Replies: 12
Views: 7340

Re: Re:

... read it before) and found no reference to what you are claiming. The closest thing that could have led to your misunderstanding was the bit about lactase persistence. If this is what you think refers to the appearance of a new gene, look up definitions of "allele" and "gene", ...

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by Cat
Sat Jul 13, 2013 12:57 am
 
Forum: Evolution
Topic: Is evolution as simple as we think?
Replies: 38
Views: 21469

Re: Re:

... read it before) and found no reference to what you are claiming. The closest thing that could have led to your misunderstanding was the bit about lactase persistence. If this is what you think refers to the appearance of a new gene, look up definitions of "allele" and "gene", ...

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by wbla3335
Mon Jul 08, 2013 9:34 pm
 
Forum: Evolution
Topic: Is evolution as simple as we think?
Replies: 38
Views: 21469

lactase persistence - middle east

Hi -- I'm looking for historical dating information about lactase persistence in the area between modern day Iraq and Egypt. I have plenty of information about Europe, Turkey and points north and west, Africa south and west of Egypt, and Saudi Arabia. ...

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by andygee
Tue Mar 05, 2013 3:22 pm
 
Forum: Genetics
Topic: lactase persistence - middle east
Replies: 0
Views: 831

Things that cause cancer (in modern humans who live longer)

... farming animals for milk for very long, but we already see genetic differences in places where milk was a necessity. In those people, the enzyme lactase is present beyond childhood.

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by wildfunguy
Wed Oct 31, 2012 4:30 pm
 
Forum: Evolution
Topic: Things that cause cancer (in modern humans who live longer)
Replies: 4
Views: 3716
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