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umka21 [38]
3 years ago
14

What three types of evidence allows us to determine whether organisms shared a common ancestor?

Biology
1 answer:
Anika [276]3 years ago
6 0

The evidence of common ancestry is based on study of three   parameters;   fossils record, homologies of various organisms, and study of biogeography. Fossils record   determines the similarity and differences of bones as well as shells of different organisms   over a given period of time.   On the other hand, studying of homologies involves assessment of mitochondrial DNA and other proteins with an aim of finding similarity from one organism to another.  Finally, Biogeography is the assessment of how continental drift might have separated organisms which had got common ancestry and they were living together.


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The diploid number of chromosomes in the mustard plant, Arabidopsis thaliana, is 10. Knowing this, answer the following question
lukranit [14]

Answer:

10 chromosomes/sister chromatids

Explanation:

Prophase is the first stage of cell division (mitosis). Prior to the cell entering the actual division stage, it undergoes a phase where it prepares its content and most importantly undergo the duplication of its genetic material (DNA). This DNA are found as chromosomes. It undergoes replication of its DNA in the S-phase of interphase stage.

Since Arabidopsis thaliana has 10 chromosomes, and each chromosome holds one DNA molecule, 10 molecules of DNA will be present in the mustard plant's genome. These 10 molecules of DNA will be replicated on another copy of chromosome which is identical to the template. This chromosomes are called SISTER chromatids i.e. replicated chromosome. Each sister chromatids are held together at the centromere and are considered one individual chromosome until they separate during anaphase stage.

Hence, at the Prophase stage, before separation, each sister chromatid (replicated chromosome) is considered as one chromosome. Thus, in the mustard plant with 10 chromosomes, it will possess 10 sister chromatids or chromosomes at the Prophase stage.

N.B: When sister chromatids separate during anaphase stage, they will be regarded as individual chromosomes.

6 0
3 years ago
You are an evolutionary entomologist. You have observed beetles that can raise their abdomens and give off a defensive chemical
bagirrra123 [75]

Answer:

mimicry

Explanation:

Mimicry -

It is the resemblance in between two organisms of different species or may be of the same species .

The main reason for mimicry is the protection of the species from the predators .

From the question , the beetles in the second case mimic the characteristic of the first beetle , by raising their abdomen , just top protect them selves .

Hence , the correct term for the given question is - mimicry .

4 0
3 years ago
Does a prokaryotic cell or a eukaryotic cell seem more simple? Explain our answer.​
dedylja [7]

Answer:

prokaryotic

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I think that because since it doesn't have a nucleus or as many organelles as eukaryotic. They are smaller in size and don't have membrane bound structures.

6 0
3 years ago
How does the loss of leaves help a plant survive winter or long periods without rain?
dexar [7]

Answer:

because It loses leaves so that it can keep all of the nutrients and water to the ruts and steam

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It can always grow more leaves

6 0
2 years ago
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