1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
erma4kov [3.2K]
2 years ago
12

4. Summarize how a single change at the cellular level can impact the entire body

Biology
1 answer:
aev [14]2 years ago
8 0
Once an egg is fertilized by a sperm, a zygote is formed. The zygote divides into multiple cells in a process known as cleavage, triggering the beginning of embryonic differentiation. ... Cells in these three layers will give rise to different parts of the organism. The endoderm eventually becomes the gut.Mar 3, 2011
You might be interested in
Which type of preparations should be patted onto the skin rather than rubbed in?
Zigmanuir [339]

Answer: Lotion

The type of preparation that must be patted onto the skin rather than rubbed in is lotion. The reason why it should be patted is to prevent increase circulation and itching. Lotions are water base and for external use only to soothe or protect the skin from dryness.

6 0
3 years ago
Why are invasive species a threat to biodiversity
lianna [129]

Invasive species cause more damage than some pollutants. Almost half of the native species in America are endangered because of invasive species. Compared to other threats to biodiversity, invasive introduced species rank second only to habitat destruction, such as forest clearing.

3 0
3 years ago
Read 2 more answers
Record the stages of meiosis in eukaryotic cells realizing that there are two cell divisions involved, each having their particu
Leya [2.2K]
1.1
Meiosis I
The first meiotic division: diploid → haploid
    Prophase I: Chromosomes condense, nuclear membrane dissolves, homologous chromosomes join and occurs crossing over.
    Metaphase-I: the homologous chromosomes align in the middle of the cell. Spindle fibers from the centrosomes connect to the chromosomes.
    Anaphase -I: Spindle fibers contract and split the homologous chromosomes, moving them to opposite poles of the cell.
    Telophase -I: Chromosomes decondense; cell divides to form two haploid cells.

1.2 Meiosis II
The second division: separates sister chromatids (these chromatids may not be identical due to crossing over in prophase I)

     Prophase II: Chromosomes condense, nuclear membrane dissolves, centrosomes move to opposite poles (perpendicular to before)
    Metaphase-II:  the chromosomes align in the middle of the cell. Spindle fibers from the centrosomes connect to the chromosomes (at the centromere)
    Anaphase-II: Spindle fibers contract and split the sister chromatids, and moves them to opposite poles of the cell.
    Telophase-II: Chromosomes decondense,cells divides again to form another 2 haploid daughter cells. Final: 4 new cells.


2. The differences:
Mitosis:
- has 1 division per cycle
- one cell produces 2 new cells
- the genetic information in the mother-cell and the daughter-cells are the same. ( the number of chromosomes is also the same)
- it occurs in somatic cells
Meiosis:
- two divisions per cycle
- one cell when divides produces 4 new cells
- the new cells have different genetic information. mixes the genetic material from the parent cells
- the number of chromosomes of the daughter cells is half of the mother's.

3. Prokaryotic organisms don't divide through mitosis, they use a different process called binary fission. Only eukaryotic organisms, or those whose cells have a defined nuclei, undergo mitosis. Bacteria, for example, are prokaryotic organisms that use binary fission.

4.
 It can't occur. Cross over is the exchange of DNA between homologous chromosomes.  That will result in recombinant chromosomes during sexual reproduction. It can't occur on different chromosomes because they don't code for the same genes.

5. There are a lot of different theories about that, but it's mostly believed that meiosis must evolve before sexual reproduction. That's because The cell replicates their information first and then divides. Plus the cell does that even though it didn't recombine DNA with another organism (sexual reproduction).

3 0
3 years ago
Which of the following is NOT true about the digestive system of annelids?
lapo4ka [179]
Yes I think you are right. It does not contain setae for food to travel to the anus. But it's something else that develops the food into poop and travels through anus

Hope this helps :)
5 0
3 years ago
The process by which electrons from the quinone pool are forced against the thermodynamic gradient to reduce nad+ to nadh is cal
Lesechka [4]

<em><u>Question</u></em><u>:</u> The process by which electrons from the quinone pool are forced against the thermodynamic gradient to reduce nad+ to nadh is called reverse

<em><u>Answer:</u></em> Reverse Electron Flow

<h3>^^Hope this helps and have a wonderful day^^</h3>
6 0
3 years ago
Other questions:
  • Which organelle is the store house for most of a cells genetic information
    12·2 answers
  • Where in the body can you find connective tissue?
    10·2 answers
  • How is facilitated diffusion similar to diffusion through ion channel
    5·1 answer
  • PLZ HELP meh!!!!!!!!!!!!!!!!!!!!
    14·2 answers
  • A car traveling at 15 m/s starts to decelerate steadily. It comes to a complete stop in 10 seconds. what is its acceleration ?
    12·1 answer
  • Which of the following is not a part of an atp molecule
    6·1 answer
  • Which term describes any relationship in which two species live closely together?
    5·1 answer
  • Plesiosaurs swam by using their paddle-like limbs in a manner similar to that of a
    7·1 answer
  • Which of the following comparisons of the autonomic nervous system (ANS) and the somatic nervous system (SNS) is not true?
    14·2 answers
  • How does energy get from one organism to another?
    15·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!