The genetic basis for lactose intolerance is a change in the nucleotide sequence outside of the lactase gene.
Lactose is normally hydrolyzed and broken down in the small intestine.
Lactose intolerance is due to mutations in the MCM6 gene, which regulates the expression of the lactase gene associated with the persistence of enzyme activity in adults.
The lactase enzyme is synthesized from the expression of the LCT gene.
The expression of the LCT gene is regulated by a protein complex (MCM), which is partly encoded by a specific sequence of the MCM6 gene located on chromosome 2q21.
A genetic alteration of this gene, specifically in position 13910, is responsible for the persistence or non-persistence of lactase in the adult.
The nucleotide sequence C / C (Cytosine / Cytosine) would be the one present in the non-persistence of lactase.
Therefore, we can conclude that lactose intolerance is due to a decrease or absence of the activity of the lactase enzyme and that it is due to a change in the nucleotide sequence that helps to control the expression of the LCT gene.
Learn more about lactose intolerance here: brainly.com/question/17178339
Answer:
The answer is 1050
Explanation:
A simple trace on the graph representing the information in the question shows that on graph B (which represents the moths captured per generation from the polluted forest), approximately 1050 moths were captured in the same generation when 200 dark months were captured from the clean forest A.
The above experiment was carried out to determine the extent of Industrial melanism.
Industrial Melanism refers to the artificially induced coloration (mostly dark hues) which affect both plants and animals in some cases stifling their growth or even killing them.
Whereas dark-colored moths were prevalent in the polluted areas after the Industrial Revolution, their numbers declined and more butter-colored moths emerged as pollution reduced.
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Answer:
This is a scientific model
Explanation:
This is a scientific model because it rightly explains the water cycle and makes it easy to understand in a list of steps and examples
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stomach villi and blood distribute food
Answer:
Earth's primordial soup
Explanation:
Alexander Oparin was a Soviet biochemist who proposed theories for the origin of life through a book he called "The Origin of Life". He claimed that life on earth came about as a result of a gradual chemical evolution which is a mixture of carbon-based molecules that he called Earth's primordial soup (or sometimes called "organic soup").