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Andre45 [30]
3 years ago
12

What makes a fossil an index fossil ?

Biology
2 answers:
Masja [62]3 years ago
5 0

Answer:

An index fossil is a fossil used to determine the age of the sediments in which it is found. When quickly approximating the age of new finds, an archaeologist looks at the rocks in which it is buried, as those sediments would have been on the surface at the time of the death of the pre-historic creature.

hope this helps

bulgar [2K]3 years ago
4 0

Explanation:

A fossil is an index fossil when it is distinctive, abundant, and limited in geological areas. A good index fossil lived for a short period of time so that the range of ages of the strata in which the index fossil is located is small. A good index fossil is found in a wide geological range.

A fossil is an index fossil when animals or plants preserved in the rock record of the Earth is characteristic by a particular span of geologic time or environment.

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Answer:

In one way, the existence of a nonsense mutation would lead to the generation of a premature termination codon that will be identified by the RNA polymerase as a termination sequence encouraged by the activity of Rho factor to dissociate ribosome, thus, discharging RNA polymerase and preventing further transcription mechanism making the transcription of the downstream sequence impossible.  

For the second way, there is a need to consider that the mechanism is taking place post-transcriptionally. Thus, the effects should be devised after transcription has taken place and the only fate lies in the mechanism encouraged by the RNA dependent RNA-polymerase. However, for this to take place, the event of genetic recombination can also be taken into account leading to the appearance of the faulty gene in the sequence. Apart from this, the open reading frame is required to be co-expressive that would be the most suitable factor, which determines whether the downstream sequences will be transcribed or not post nonsense mutation.  

However, the total change relies upon the fact that the mutation is taking place artificially or is induced naturally. One more thing to consider is that there is an existence of another gene known as MCB 354, which is encrypted by another gene and is probably monitored by another promoter sequence. Thus, co-expression would probably be the mechanism in terms of the rho-dependent termination.  

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