Question 1 Humans share several features with salamanders. Certain genes and pro

Question

Question 1

Humans share several features with salamanders. Certain genes and proteins are nearly identical between the two species; both species have four limbs with a similar skeletal structure; the species' early embryos are very similar; and where the salamander has a functional tail, humans have a vestigial tailbone. In evolutionary terms, these are examples of

Question 1 options:

geographic similarity.

coincidental similarity.

adaptation by natural selection.

homology.

Question 2

Which of the following statements about adaptation is true?

Question 2 options:

Adaptation is possible when all the alleles in a gene pool are the same.

Adaptation results when cold temperatures cause mutations for longer fur.

An individual that has learned how to survive cold winters has become adapted to the cold.

A population that has an increase in frequency of alleles for thicker fur has become adapted to the cold.

Save

Question 3

Which of the following best expresses the concept of natural selection?

Question 3 options:

a process of constant improvement, leading eventually to perfection

inheritance of acquired characteristics

change in response to need

differential reproductive success based on inherited characteristics

Question 4

Which of the following would prevent an organism from becoming part of the fossil record when it dies?

Question 4 options:

It is frozen in ice.

It is fully decomposed by bacteria and fungi.

It gets trapped in sap.

It is buried in fine sediments at the bottom of a lake.

geographic similarity.

coincidental similarity.

adaptation by natural selection.

homology.

Explanation / Answer

1. homology

Homologus organisms are similar in many aspects as they originated from a common ancestor; so the ancestral characters are shared by the homologus organisms (here, human & salamander).

2. Adaptation results when cold temperatures cause mutations for longer fur.

The adaptation to an environment occurs when an advantageous variation (mutation) occurs; here mutation for longer fur is an advantageous mutation as it helps in mitigating the harsh cold climate.

3. a process of constant improvement, leading eventually to perfection.

Theory of Natural selection states that nature acts as a sieve & selects the individuals with advantageous variations, & discards those with disavantageous variations; thereby improving the overall population's gene pool.

4. It is fully decomposed by bacteria and fungi.

If an organism is decomposed by micro-organisms, then it will not leave an imprint or palaeontological evidence.

On the other three cases, the organism will leave evidence of its existence.

Related Questions

Navigate

• Browse (All)
• Browse Q
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.