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mixas84 [53]
3 years ago
15

Why do some species employ both mitosis and meiosis, whereas other species use only mitosis? See concept 13.2 (page 258)?

Biology
2 answers:
svetlana [45]3 years ago
7 0
Some species cell division produces reproductive cells in sexually reproduce organisms
beks73 [17]3 years ago
6 0

Answer:

Sex cells divide through meiosis and non sex cells divide through mitosis in animals while in plants sex cell divide through both mitosis and meiosis

Explanation:

In humans and all other animal species, the non sex cells such as skin cell, muscle cell, blood cells etc. divided by mitosis. It is so because these cells deplete at a fast rate and hence their retrieval also needs to be fast. Also these are diploid cells hence cell divide through mitosis. Sex cells such as male and female gametes are haploid cells and hence their divide through meiosis.  

In plants gamete formation requires both mitosis and meiosis cell division.  

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Discuss why prokaryotic cells probably appeared before eukaryotic cells​
dsp73

Answer:

Prokaryotes are smaller and less developed compared to eukaryotes. Some of them inhabit very primitive environments that resemble earth’s early stages. Endosymbiotic theory states that eukaryotes arose by the endosymbiosis of prokaryotes.

Explanation

By endosymbiont theory, eukaryotic cells arise from prokaryotic cells. Here, the theory shows that eukaryotic ancestors lived in close association with prokaryotes, wherein in some cases, prokaryotes have been engulfed and might have lived inside eukaryotes.

Upon being engulfed by a host cell as undigested prey, these prokaryotes could have been internal parasites of the eukaryotes. But, later on, their relationship becomes mutualistic and these prokaryotes become incorporated as organelles, such as in the case of chloroplasts and mitochondria, which were previously separate prokaryotes

______________________________________

6 0
2 years ago
________ is a process that creates genetic variety in cells. (2 points)
Zigmanuir [339]

Answer:

B

Explanation:

I believe it is meiosis because there are two parts in which it helps to increase genetic variety. In prophase 1, the genes cross over, which increases the variety. Also, the chromosomes are assigned randomly in Metaphase 1.

Hope this helps:)

4 0
2 years ago
Read 2 more answers
What is pancreatitis and what is the basic mechanism that underlies the condition?
svp [43]
Pancreatitis is an inflammation of the pancreas that may be caused by years of heavy consumption of alcohol of gall stones. The pancreas plays major important roles such as secreting digestive juices into the small intestines, which help to digest fats, proteins, and the carbohydrates in food. It also release hormones insulin and glucagon that regulate the blood sugar. Pancreatitis is characterized by a pancreas being inflamed, therefore when this happens the body's normal complex coordination is disrupted and the enzymes in the pancreas are prematurely activated before they exit the organ, which results in these enzymes digesting the pancreatic tissue.
7 0
2 years ago
A set of genes whose transcription is regulated by an operator gene is called a(n) _______.
shepuryov [24]
The answer is operon. These set of genes are transcribed together because they share a single promoter and operator. Therefore they are transcribed into one mRNA and translated together. These genes are, therefore, expressed together at all times. Examples are the tryptophan and lac operons of Escherichia coli
6 0
3 years ago
9. A protein molecule which is denatured, has
seraphim [82]

Answer: B. combined with another molecule

Explanation:

i just took the test

4 0
2 years ago
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