Lactase persistence is question 20 options a a recessive...

Lactase persistence is Question 20 options: a) a recessive trait that causes a minority of humans to be unable to digest milk. b) a dominant trait that allows most humans to digest milk as adults. c) the ability for milk proteins to be preserved long term in the fossil record. d) an autosomally inherited version of the LCT gene that allows a minority of humans to digest milk as adults.

Transcript

00:01 Hi, in today's video we will discuss about an interesting topic that is lactose persistence we need to identify the statement that is true about lactose persistence so we have five options given over here and we need to identify the correct one so let's begin our answer with the what is lactose persistence the ability of humans or any other organism to digest or to absorb lactose present in milk is known as lachstose persistence there are several organisms that cannot digest lactose but which is known as lactose intolerance.

00:40 But lactose persistence is a condition which an individual can digest lactose in the milk.

00:46 So we have five options given.

00:48 Let's discuss each one of them.

00:50 Option b, it is saying that mutation in lactose gene, that means there is a gene known as lactase gene.

00:58 And this gene, if functions normally in normal condition, condition make the person lactose persistence.

01:15 But mutation in this gene will cause if this gene can mutated or mutation in this gene will cause lactose intolerance.

01:24 Hence it is not a correct statement because the statement is saying mutation will cause lactose persistence hence it is an incorrect statement.

01:34 Coming to option c, option c or statement c is saying mutation rate of lactose gene is higher in herding population.

01:43 The disease that has more chances to get a rise in herding population is an infectious disease or the disease which is contagious in nature, contagious is nature, that means which can be transmitted from one person to another.

02:00 The herding population are more prone for contagious disease and contagious disease are the ones that varies from herding and non -herding population.

02:08 But lactose persistence or lactose intolerance occurs because of mutation.

02:15 Lactose intolerance occur because of mutation and normal functioning of lactose gene will cause lactose persistence.

02:21 Lactose persistence does not depend on or do not depend on herding or non -herding population.

02:33 Hence it is also an incorrect statement...

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