Identify the correct systematic name of the disaccharide alpha lactose

β-D-galactopyranosyl-(1→4) -α-D-glucopyranose.

Explanation:

Disaccharide alpha lactose is basically a molecule that contains two sugars, galactose and glucose. It is commonly present in the milk of cow and humans. It has alot of importance in pharmaceutical industry because it is used for formulation of different medicines. It is also used a s a nutrient because of the great proportion of sugar content.

It also plays an important role in the process of lactation in humans upon the birth of new born babies. It helps in osmotic regulation of several enzymes in new born babies and is digested by an enzyme called lactase. However, with the passage of time, activity of enzyme lactase slowly lowers in humans due to which they become lactose intolerant. Lactose intolerance results in poor digestion and abdominal pain in men. However, lactose is a potential nutrient component and pre-biotic for humans.

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1) gene flow

- it is described as the transfer of genes from one population to another population so that frequency of gene is increased.

-a zebra migrates to join a different herd of zebras.

2) natural selection

- a mechanism of evolutionary change in which individuals with advantageous traits survive and reproduce whereas the others ( those that can not adapt) eliminate from the population.

-competition for sunlight leads to taller trees.

3) mutation

- permanent change in the nucleotide sequence of dna ( genetic material) that could have harmful or useful consequences.

-the dna of a snake changes to make its venom stronger.

4) genetic drift - it is a random phenomenon ( that occurs by chance such as fire) that results in change in the gene frequency in a small population.    

-a grassfire randomly sweeps through a population of buffalo and kills most of the animals.

explanation:

it would lead to upper respiratory infections and pneumonia.