Answer:
Bacteria that have obtained the ability to resist the effects of antibiotics. As the diseases caused by these bacteria are hard to treat.
Explanation:
Darwin proposed that evolution is caused by natural selection.
During the industrial revolution caused tons of soot has been deposited in the countryside around industrial areas. The soot discoloured and generally darkened the surfaces of trees and rocks.
In 1848, a dark-coloured moth was first recorded. Today, in some areas, 90% or more of the-peppered moths are dark in colour. More than 70 species of moth in England have undergone a change from light to dark. Similar observations have been made in other industrial nations, including the United States.
Overusing and misusing of antibiotics causes antibiotic resistance. The ability of bacteria to resist the effects of an antibiotic is known as antibiotic resistance.
It occurs because of overuse and misuse of antibiotics over a long period of time. It also occurs if we do not use it as prescribed.
Antibiotics should not be taken every time we feel uncomfortable. We should not save it for next time and should not share it with others. If we overdose ourselves with it we may have serious side effects which can make us feel worse.
Answer:
B) 1/2 X 1/2 = 1/4
Explanation:
It happens when both the parents are heterozygous for the trait. The cross related to this result is shown as under:
Father Mother
Bb x Bb
/ \ / \
Gametes: B b B b
| | | |
Probability: 1/2 1/2 1/2 1/2
The probability of formation of 'b' gamete from father is 1/2 because there are only two gametes 'B' and 'b' and out of these two one will be assorted as 'B' and another one as 'b' and from mother also the probability of formation of 'b' gamete is 1/2.
Now the assortment of gametes with each other is an independent event i.e. any gamete from father can fuse with any gamete of mother so the overall probability of formation of 'bb' genotype will be 1/2 x 1/2 = 1/4.
Nucleic acids also typically contain phosphorous, and nitrogen plays an important structural role in nucleic and proteins. The proteins, being made up a diverse set of amino acids, have, in addition to carbon, hydrogen, oxygen, and nitrogen, the elements sulfur and selenium.