Why do allele frequencies give us genetic variation

Answer:

The correct statement is that a slow mutation rate makes it useful for determining evolutionary relationships between ancient species.

Explanation:

The rRNA or ribosomal RNA has an application as a molecular clock because of many factors. It exhibits a very slow mutation rate, that is, around one million years because of which it stays highly conserved in all the organisms. In the ribosomal RNAs of two organisms, the degree of mutations can be associated directly with the time they were originated in the past.  

In supplementation, it possesses essential biological function because of which it can be witnessed in almost all the species.  

Answer:

A slow mutation rate

Answer:

There are many theories

But main evidences are

1. Fossils of Plants animals and other organisms who lived on this planet at sometime.
2. Oprain And Halden theory which suggests the chemical and biological evolution.

Answer:

None of these.

Explanation:

Cancer mutations affect cell cycle regulators.

Cell cycle is a highly regulated process by the regulators that can promote cell cycle or inhibit the cycle. Genes that encode for those regulators are classified into two groups:

• proto-oncogenes-encode for positive regulators such as growth factor receptor. If a cancer mutation occurs in the proto-oncogene it becomes oncogene and its product is overactivated. The increased avtivity of positive regulators leads to abnormal cell division.
• tumor suppresor-the products of such genes blocks the cell cycle, but after the mutation they become inactive, which leads to uncontrolled cell cycle.

Answer: the low-pressure areas on the map are the purple triangle and half circles

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Explanation: