Answer:
they wouldnt be identical because for example Guanine could be paired with thymine in the original DNA strand but could decide to pair with adenine in the replication DNA. that would make a different type of DNA.
Explanation:
DNA replication is a beautiful process. In DNA replication adenine only pairs with thymine and guanine only pairs with cytosine. this ensures that a replication of the DNA will be the same type of DNA.
Replication works like this. Helicase splits open the DNA and each side is copied by DNA polymerase. If let's say the nucleotide bases for side 1 are ATGCGA then the DNA polymerase will pair these with the matching bases TACGCT which will make the same DNA but if each base could pair with any base they want that could create a few different variations of the original DNA. ATGCGA could very well be paired with TCGACA or CGACTA which would created two different types of DNA.
Answer:
B) There is an increase in the number of giraffes with long necks in areas of Africa where low-growing trees have died
Explanation:
The directional selection is one of the ways of the natural selection in which the natural selection selects or favours the most extreme trait of the species and the extreme trait show higher fitness than the normal or average trait.
In the given question, the case of Giraffe necks shows directional selection as the normal length of the neck is not favoured by the environment but the extreme trait that is long neck is favoured by the environment and the selection shifted to that level.
Thus, Option-B is the correct answer.
I think the answer is False
Their will be scarcity of crabs
Answer:
As image is not provided,let's discuss about ecological succession.
Explanation:
Ecological succession can be described as the development of a community from its pioneer to climax community. There are two types of ecological succession:
Primary ecological succession: This type of succession occurs in lands where there was no life before or in lands where signs of life have completely been removed like an lava eruption. The rocks in this land are broken down and slowly, pioneer species begin to grow.
Secondary Succession: This type of succession arises after a natural disaster like fire etc or after any human activity has wiped out the previous community which survived on this land. smalls shrubs and grass starts to grow back on this land, which is replaced by the intermediate species and finally with the climax community.
