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Ronch [10]
4 years ago
4

A scientist is trying to determine the relationship between clams, snails, and squid. When she generates a molecular clock, she

is surprised to see that clams and squid are more closely related than clams and snails. Which did the molecular clock data show?
Clams and squid have been evolving separately for a longer time than clams and snails.
Clams and squid have been evolving separately for a shorter time than clams and snails.
Clams and snails have more in common genetically than clams and squid.
Clams and snails are more similar in related structures than clams and squids.
Biology
1 answer:
BigorU [14]4 years ago
8 0

Answer:

Clams and squid have been evolving separately for a shorter time than clams and snails.

Explanation:

The molecular clock is the technique that, through the number of differences between two DNA molecules, allows to know the past time of the divergence between two species. By Molecular Clock theory, sequence substitutions of certain proteins occur at a constant rate, proteins would be the timers, because the number of nucleotide differences between two species would be proportional to the time of evolutionary divergence between them.

The molecular clock was used in the above question to discover the evolutionary relationships clams, squid and snails. In this experiment, it was found that clams and squids are more closely related than clams and snails. This means that clams and squids evolved separately for a shorter time than clams and snails.

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Why do the number of organisms in a group change from the first step to the last step of a dichotomous key?.
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Firstly the question is incomplete as an option is not there.

Why do the number of organisms in a group change from the first step to the last step of a dichotomous key?

a. The number of organisms decreases because the number of common characteristics of the organisms in a group increases.

b. The number of organisms increases because the number of common characteristics of the organisms in a group increases.

c. The number of organisms is cut in half because the number of common characteristics of the organisms in a group decreases by half in the last step.

d. The number of organisms stays the same because the number of common characteristics of the organisms in a group decreases by half in the last step.

The correct answer is B. The number of organisms increases because the number of common characteristics of the organisms in a group increases.

The most common key for the identification of organisms is a dichotomous key, the number of organisms in a group change from the first step to the last step of a dichotomous key as the no. of organisms increases and forms several groups of species and genus.

<h3>What is the use of the dichotomous key?</h3>

The use of dichotomous keys are :

  • contrasting characters
  • dividing organisms
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Hence concluded that the dichotomous key has a number of organisms increases because the number of common characteristics of the organisms in a group increases.

To learn more about dichotomous keys refer to the link :

brainly.com/question/1281957

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