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
Assoli18 [71]
3 years ago
5

Which of the following is not a source of genetic variation?

Biology
2 answers:
Mashcka [7]3 years ago
5 0
<span>the one that is not a source of genetic variation is : D. Asexual reproduction In asexual reproduction, there is no fertilization process between male and female gender. Which mean the offspring that came from asexual reproduction would be exactly the same as its parent, without any chance of genetic variation</span>
ycow [4]3 years ago
3 0
<span>Genetic variations are the differences between individuals in a population, the most obvious types of genetic variation are: mutation, sexual reproduction and lateral gene transfer. These all involves genes mixing or changing. Therefore (d)asexual reproduction is not a source of genetic variation; this type of gene transfer is directly moving the genes of a parent to the offspring, therefore keeping the exact same gene pattern.</span><span />
You might be interested in
Why the location and quality of food sources in the soil are sometimes likely to stimulate random movements by C. Elegans, but a
Kipish [7]

Answer:

The Caenorhabditis elegans dauer state is a hibernation-like state of diapause that displays a dramatic reduction in spontaneous locomotion.

Explanation:

Mutations affecting the neurotransmitter dopamine, which regulates voluntary movement in many organisms, can stimulate movement in dauers. The movement of quiescent animals is stimulated by conditions that reduce dopamine signaling and also by conditions predicted to increase dopamine signaling.The stimulation of movement by increased dopamine is much more pronounced in quiescent daf-2(−) dauer and dauer-like adult animals.

In C. elegans hermaphrodites, dopamine is produced by eight neurons and signals via at least four dopamine receptors, DOP-1 through DOP-4. In addition, a presynaptic reuptake transporter, DAT-1, removes dopamine from the extracellular space to terminate signaling. In C. elegans, dopamine is best known for mediating the “basal slowing response” in which the animal's movement slows when it encounters food..  Dopamine is thought to be released in response to food and to act on motor neurons to modulate the animal's movement . Animals that cannot produce dopamine fail to slow in response to food and exogenous dopamine slows the movement of animals cultured without food.The response to dopamine in this situation is complex, as the absence of specific dopamine receptors can have either positive or negative effects on movement.

8 0
3 years ago
For each cross, describe whether genetics or temperature determines the sex of progeny produced from eggs incubated at 35 degree
goldenfox [79]

<u>Answer and Explanation</u>:

In reptiles, there are two mechanisms of sex determination:

-Genetic mechanisms, determined at the fertilization moment

-Environmental mechanisms, which are temperature-dependent.

Temperature is an environmental factor that affects different processes in organisms at a molecular level, biochemical level, or physiological level. In reptiles such as lizards, snakes, turtles, crocodiles, among other, temperature influences their embryonary development, their growth, daily activities, reproduction rate, sex determination, and etc.

In lizards, it occurs that whenever eggs are incubated at low temperatures, between 22 º and 27ºC, they produce a higher percentage of males, while eggs exposed to higher temperatures, 30ºC and above, produce more females. There are only a few degrees of temperature at which exposed eggs produce males and females equally.

The importance of knowing the mechanism of organisms´ sex determination lies in how climate change may be affecting wild populations due to fluctuations in temperature.

In the exposed example, the first cross between ZZ males and ZW females, genetics is the mechanism that determines the sex of progeny produced from eggs incubated at 24 and 35 degrees celsius. While in the second cross between ZZmales and ZZ females, temperature determines the sex of progeny produced from eggs incubated at 24 and 35 degrees celsius. This is, eggs exposed to temperatures below 28ºC will produce only males, so there won't be any female in the progeny. But eggs incubated at 30ºC and over will produce females, as shown in the table.

3 0
3 years ago
Why don't antibiotic work on viruses?
Aleksandr [31]
Antibiotics are meant to kill living things (bacteria). Viruses, on the other hand, we are not sure if they would classify as living. Viruses change the meaning of "life" if we consider them alive. They can <em>only </em>reproduce within another cell by taking over that cell. An antibiotic would have to be able to kill human cells to kill a virus, and that would not be a good medicine to take. Viruses invade a host cell and incorporate the virus DNA into the host cell's DNA, which would cause the host cell to create more viruses to invade other cells. <span />
8 0
3 years ago
What does dna rna and starch all have in common
77julia77 [94]
Dna , rna, and starch these three are important biomolecules that play a vital role in your life even though you have never seen them.
8 0
3 years ago
The branch of biology that deals with heredity and variation is
Karolina [17]
I thinks it's Genetics. I might be wrong tho
5 0
3 years ago
Other questions:
  • Breathing rate is constantly being monitored and adjusted in the human body which result in
    14·2 answers
  • A neuron cell body reaches threshold and depolarizes. The depolarization propagates down the length of the ______, is chemically
    9·1 answer
  • a cell will usually undergo apoptosis if the cell experiences dna damage that could lead to a tumor. Predict what may happen if
    6·1 answer
  • Which sentence best describes a cell that is isotonic for a substance?
    12·2 answers
  • Darwin observed that finches on the Galapagos Islands have different kinds of beaks. Which conclusion is best supported by his o
    10·2 answers
  • The pyruvate dehydrogenase (PDH) complex catalyzes the oxidative decarboxylation of pyruvate to acetyl−CoA and CO 2 . CO2. Multi
    7·1 answer
  • Which characteristics is common of developing countries?
    15·1 answer
  • Can you please tell me an explanation of what happens during the telophase stage of mitosis?
    14·1 answer
  • 1. What type of chemical reaction is the following equation?<br> AIBr3 +K → KBr + AI
    7·2 answers
  • Plz help me with my mothers quiz. I will give brainliest. I appreciate all ppl that help thank you so much.
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!