How is lactase an example of fitness in humans?

Biology

1 answer:

amm18122 years ago

6 0

$\\$

Evolutionary advantages. Lactase persistence is a text-book example of natural selection in humans: it has been reported to present stronger selection pressure than any other known human gene. However, the specific reasons as to why lactase persistence confers a selective advantage "remain open to speculation".

<h3>WHAT THEY DO IN HUMAN BODY?</h3>

Lactase breaks down the lactose in food so your body can absorb it. People who are lactose intolerant have unpleasant symptoms after eating or drinking milk or milk products. These symptoms include bloating, diarrhea, and gas. Lactose intolerance is not the same thing as having a food allergy to milk.

In pastoralist populations, individuals with the lactase-persistence mutations were more likely to survive, reproduce, and pass on their alleles than people without the mutations, especially in times of famine.

$\\$

Hope It Helps!

You might be interested in

At the end of cytokinesis, how many daughter chromosomes will be found in each cell

trapecia [35]

At the end of cytokinesis there no longer exists chromatids, they are just individual chromosomes.

If you're talking about Meiosis, there are 4 (HAPLOID) daughter cells produced at the end of meiosis. So each daughter cell will have HALF the number of chromosomes as the mother cell.

Whereas at the end of Mitosis there are 2 identical DIPLOID sister cells.

Sources~ yahoo answers
And just now learned it last week

Hope this helped ~ Mgd5805 :)

4 0

3 years ago

What protects cells from the particles outside

Elenna [48]

The Cell Wall protects the cell from particles outside.

8 0

2 years ago

Describe how oxygen gas (O2) is produced during photosynthesis. Include the specific structures in the plant where the reaction

Softa [21]

In light reactions, a molecule of chlorophyll absorbs one photon of light, causing a chlorophyll electron to transfer to a higher energy level. ... Chlorophyll then replaces the lost electrons from water molecules. The oxygen atoms form oxygen gas while the hydrogen atoms form protons and electrons.

6 0

2 years ago

The conversion of malate to oxaloacetate in the citric acid cycle takes place with the conversion of NAD to NADH. In this reacti

Mariana [72]

Answer:

a) the oxidizing agent.

Explanation:

In the citric acid cycle, malate is dehydrogenated into oxaloacetate and the reaction is catalyzed by malate dehydrogenase. The released electrons are accepted by NAD+. So, NAD+ is reduced into NADH. The substances that accept electrons during chemical reactions and are reduced to oxidize the other substances are called oxidizing agents. NAD+ serves as an oxidizing agent as it accepts electrons to oxidize malate into oxaloacetate.

5 0

2 years ago

How is earth's early land environment different than today's land environment?

Natalka [10]

The question is asking to states on how i earth's early lang environment different than today's land environment and base on my research, I would say that in the past centuries or early ages, the Earth's land environment are compost of tree and plants and the air is still fresh. I hope you are satisfied with my answer and feel free too ask for more

3 0

3 years ago