Answer: Genetic variation in a population is derived from a wide assortment of genes and alleles. The persistence of populations over time through changing environments depends on their capacity to adapt to shifting external conditions.
Explanation:
Q.2. Describe the different phases of meiotic prophase – I. Mention the chromosomal events during each stage.
Prophase-I occurs over a long duration and involves several complicated changes in meiotic cell division. It is important because genetic recombineiion and variation in sexually reproducing organism occurs due to the events of this phase.
EXPLANATION:❈ Leptotene —
➥ The chromatin network opens out and threads become clear.
➥ The chromosomes are thin, slender and long.
➥ Chromosome number is diploid.
❈ Zygotene —
➥ Corresponding chromosomes become intimately associated.
➥ The process of pairing is known as synapse. It is so exact that pairing is not merely between corresponding chromosomes but between corresponding individual units.
➥ The chromosomes become shorter and thicker.
❈ Pachytene or Pachynema —
➥ The synaptic chromosomes become very intimately associated.
➥ The pair of chromosomes becomes short and thick.
➥ Crossing over occurs at this stage. Chiasmata are clearly seen.
❈ Diplotene —
➥ Homologous chromosomes start separating from one another.
➥ Chiasmata tend to slip out of the chromosomes. This is known as terminalisation of chiasmata.
➥ Chromosomes start separating out but the separation is not complete.
➥ Nuclear membrane and nucleolus start disappearing.
❈ Diakinesis —
➥ The bivalents condense further and get randomly distributed.
➥ The separation of paired chromosomes is almost complete.
➥ Terminalisation of chiasmata is almost complete.
➥ Nuclear membrane and nucleolus disappear.
Why are organisms that reproduce sexually less likely to accumulate deleterious mutations ?
how do you know when a surface has produced more friction
Answer:
Rougher surfaces have more friction between them. Heavier objects also have more friction because they press together with greater force.
Hard Rough Surfaces and Plowing
More plowing will result in a higher the friction coefficient, uplow, and thus higher sliding friction force.
what are given off as by-products of cellular respiration?
a. carbon dioxide and water
b. energy
c. food
d. oxygen
2. Why do we need carbohydrates ?Name three sources of carbohydrate in our food
Answer:
Carbohydrates are the body's main source of energy. In their absence, your body will use protein and fat for energy. It may also be hard to get enough fibre, which is important for long-term health.
Carbohydrates are found in a wide array of both healthy and unhealthy foods—bread, beans, milk, popcorn, potatoes, cookies, spaghetti, soft drinks, corn, and cherry pie etc.
Explanation:
brainliest pls
X + H20 → Y + O2(what would be y in this equation ?)
Answer:
y. 2. • CxHy + O2 → x CO2 + y/2 H2O. Combustion Problem. Erythrose is an important mono-saccharide that is used in chemical synthesis. It contains Carbon.
Explanation:
In the chemical equation X + H₂O → Y + O₂, Y represents the product of the chemical reaction, here Y is the glucose, and this X is carbon dioxide, and this is a reaction of the photosynthesis.
What is photosynthesis?During photosynthesis, the energy from light is used to split water molecules into oxygen and hydrogen ions. The oxygen is released into the atmosphere as a waste product, while the hydrogen ions are used to create a chemical gradient across the thylakoid membrane within the chloroplast. This gradient is then used to power the creation of ATP, the energy currency of cells, as well as to reduce carbon dioxide to form organic molecules, such as glucose. The overall equation for photosynthesis is:
6 CO₂ + 6 H₂O + light energy → C₆H₁₂O₆ + 6 O₂
Hence, In the chemical equation X + H₂O → Y + O₂, Y represents the product of the chemical reaction; here, Y is the glucose.
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“Explain how chemical energy for use in the cell is generated by electron transport and chemiosmosis”
PLEASE HELP!!
*50 points to whoever can answer that question and draw a flowchart, thank you*
Answer: The ETC is the last part of cellular respiration. In the first steps of cellular respiration (glycolysis and Krebs cylce), electrons are freed from glucose derived molecules. In the ETC the electrons are passed on through a series of proteins in the inner membrane of the mitochondria. The electrons in a sense 'flow' to lower energy levels (see image), they lose energy in the process.
Energy produced by H+ travelling via ATP synthase and down a concentration gradient is used by chemiosmosis. ADP is phosphorylated with this energy to create ATP.
What is Chemiosmosis?Chemiosmosis is the passage of ions along their electrochemical gradient through a semipermeable transmembrane domain structure. Adenosine triphosphate is created when hydrogen ions pass a membrane during photosynthesis or cellular respiration. This is a significant example.
The process of ions (often H+ ions, commonly referred to as protons) diffusing across a membrane that is selectively permeable is known as chemiosmosis. Chemiosmosis produces a concentration gradient of a diffusing ion from across membrane, similar to osmosis. Potential energy that can perform work is present in concentration gradients.
Thus, energy produced by H+ travelling via ATP synthase and down a concentration gradient is used by chemiosmosis. ADP is phosphorylated with this energy to create ATP.
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What is the independent variable of great white sharks travelling distance?
Answer:
Each year, great white sharks migrate over long distances from their feeding grounds off the central California coast to other feeding grounds far away in the Pacific Ocean. ... That's one reason they migrate from one feeding ground to another, to take advantage of the seasonal bounty.
It's though that a shark can travel up to 50 miles in one day. While we cannot know this for certain as sharks have never been tracked this way, 50 miles is a good estimate
Are data that do not support a hypothesis useful?
A. Yes, because the data prove that the experiment was designed
poorly
B. Yes, because the data provide useful information that can lead to
more testing
C. No, because the data show that the experiment failed
D. No, because the data must be inaccurate
Which sentence best supports the idea
that fossils help us learn more about
the history of the earth?
Natural geological processes
bring layers of rock to the
surface.
Most animals of our past did
not fossilize.
wit
Speac
The largest dinosaur fossil
ever found was of a
Brachiosaurus.
sroamed the
posed to
slowly
d, the remains
Paleontologists know about
the diversity of life that has existed since the beginning of time
Answer:
D the remains Paleontologists know about the diversity of live that has existed since the beginning of time
Explanation:
fossils assist in understanding of evolution throughout the billions of years that the earth has housed living beings. it allows us to even date history
Molecules that do not contain carbon are called inorganic.
true or false
Answer:
The answer is false
Explanation:
because most carbon are harmful and are added by humans
Biologically speaking what is the only purpose of reproduction
Answer: To prevent extinction
Explanation: This is to say the main purpose of reproduction is for the continuation of species.
Ok, do we live in or on earth?
Answer:
On, we live on the surface of Earth.
If we lived in it, we'd be near the core, or literally inside the earth's many layers.
Hope that helps! :)
-Aphrodite
Explanation:
2. Which of the following plants might be specifically chosen to attract tiger swallowtail butterflies to a garden?
a. milkweed
b. tulip poplar
c. aspen
d. nasturtium
Answer:
b
Explanation:
Common host plants attract tulip tree
I haven't really gotten into much detail about this subject.
Hope this helps!
Why cells divide and what happens to genetic material during cell division.
Please I beg you help me. Contrast solids,liquids, and gases on the molecular level
gas vibrate and move freely at high speeds. liquid vibrate, move about, and slide past each other. solid vibrate (jiggle) but generally do not move from place to place.
List all the biotic and abiotic factors in figure 4
Answer:
1
Explanation:
which of these statements about the stars' apparent motion in the night sky are true? choose all that apply ( it could be more than one answer)
A. The orbit of stars around the sun causes stars to appear to move in the night sky.
B. The orbit of stars around the center of the galaxy causes stars to appear to move in the night sky
C. The rotation of earth on its axis causes stars to appear to move in the night sky.
D. The orbit of earth around the sun causes stars to appear to move in the night sky.
i have 1 hour left
What type of reproduction involves forming offspring from two
parents?
a Asexual
b Sexual
C Mitosis
int?
d Replication
Answer:
Sexual
Explanation:
Sexual reproduction involves two parents and produces offspring that are genetically unique. During sexual reproduction, two haploid gametes join in the process of fertilization to produce a diploid zygote. Meiosis is the type of cell division that produces gametes.
Hope it helps
Answer: Sexual, I believe.
Explanation:
If it were Asexual, it'd only involve one parent. Mitosis has daughter cells have the same number of chromosomes as parent cells (heavy emphasis on cells as in plural cells.) And replication is just copying a cell.
Forgive me if I'm wrong!
In the gold rush of 1849, prospectors found a yellow mineral that appeared to be gold, but was harder and more brittle than gold. What is this mineral that came to be called “fool’s gold”?
Answer:
Pyrite
Explanation:
I hope this helps!
Answer:
Pyrite
Explanation:
I hope this helps!
Which is a chemical property?
A. Mass
B.flammability
Answer:B flammability
Explanation:
Its a chemical change because the chemicals in the substance change when being lit on fire (example burning wood)
A giraffe has a really long neck and feeds on the leaves of plants. How is having a long neck an adaptation that helps the giraffe to survive? (2 points) a It allows the giraffe to eat the plants faster than other animals. b It allows the giraffe to get food from tall trees that other animals cannot reach. c It helps the giraffe keep balance as it eats plant leaves. d It helps the giraffe run faster when attacked by predators.
Answer:
B.) It allows the giraffe to get food from tall trees that other animals cannot reach.
Explanation:
-
One of the distinguishing characteristics of a giraffe is its long neck. The neck has several important roles and specific functions Feeding. With the aid of its long neck a giraffe is able to reach leaves fruit and flowers high up in Vachellia or Senegalia. Formerly Acacia and other sought after tree species. Giraffe are thus equipped to exploit a band of foliage. So answer would be B
The amount of energy available in the form of nonrenewable resources is finite. You can personally make a difference in making sure that the world continues to have enough energy to supply electricity to everyone who needs it. Today’s assignment is an opportunity to do research into ways that you can make an impact.
Your research will focus on creating a plan that you want to present to one of the following:
your family
a club or team that you are a part of
a community organization like your church or school
The purpose of your plan is to see the world’s energy last a long time. There are a couple of categories to consider, such as different ways to do the following things:
Use renewable resources (example: adding solar panels to a building)
Conserve energy (example: reducing the amount of electricity used)
Reduce, reuse, and recycle (example: planning a recycling drive)
Add “green spaces” (example: growing vegetables in a garden)
You need to find three websites related to your idea. Look for other individuals or groups that have accomplished a similar goal. Once you have found your websites, answer the following questions. Number each question and make sure to write your answers in complete sentences.
What project do you want to propose and who do you want to participate?
What are the three websites you found that helped you choose a project and/or described other people doing similar projects?
After reading their stories and thinking about your own ideas, describe your idea for your project. Think of your answer as your presentation of your idea to your group. Make sure to tell them what you want to accomplish and why it is important.
In your research, find a difficulty that others faced that you might need to consider. Explain the issue and how it might impact your plan.
Choose one story from your research that you found most inspiring. Share a quotation and explain why this was meaningful.
Answer:
This really was helpful I learn a lot which is meaningful
can anyone help me with this it would really help me out right now
Answer:
I think it's insects ....
A sexually mature seahorse can produce thousands of offspring. What is the BEST reason overproduction of offspring by marine organisms is considered to be a reproductive advantage?
It increases competition.
It decreases competition.
It contributes to the organism’s biological success.
It causes stress on the environment which will apply stress to the creature to adapt.
Answer: D
Explanation:
There are large number of predators present in marine environment. Overproduction of offspring contributes the biological success of the organism.
What is overproduction?Overproduction is referred to the production of large number of species which can be physically supported by ecosystem.
Overproduction support survival of the fittest, by improving the genetic line.
Since the predators are more so, only that organism will survive who can adapt according to the that. This can contributes in organism's biological success.
Thus, the correct answer is C.
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Jack found a fossil in a rock that he dug up. The fossil is of a fish.
Which can the fossil tell him about the land when the fish was alive?
Jack found a fossil in a rock that he dug up. The fossil is of a fish. That there was water there once. A fossil record provides the proof of the typical progenitor and its many species.
What are the fossils?Fossils are the preserved remains of flora and faunna whose bodies were seeded in sediments, such as sand and mud, under ancient seas, lakes and rivers.
Fossils also include any preserved trace of life that is usually more than 10 000 years old.
Thus, The fossil is of a fish. That there was water there once.
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When are chromosome mostly condensed
Metaphase is a stage of mitosis in the eukaryotic cell cycle in which chromosomes are at their second-most condensed and coiled stage (they are at their most condensed in anaphase).
For each condon ,find the correct tRNA
An ecosystem that retains structure & continues normal functions even when environmental conditions change is?
Resilient
Resistant
Reductive
Reconciled
Answer:
Resistant
Explanation:
A good aspect of the ecosystem can either be resistant or resilient when there is a disturbance or a form of deviation from the regular occurrence in the ecosystem structure, function, or both.
For an ecosystem to be resistant means it maintains structures and goes on with normal functions despite the disturbance or alteration in environmental circumstances.
Hence, in this case, an ecosystem that retains the structure and continues normal functions even when environmental conditions change is RESISTANT.
_________ inherited traits that increase an organisms chance of survival, also determine an organism’s niche.
Answer:
adaptation
Explanation:
1 : the act or process of changing to better suit a situation. 2 : a body part or feature or a behavior that helps a living thing survive and function better in its environment. adaptation
Answer: Adaptations
Explanation: Got it correct on ECAD T1 Summer 2023 NM-Biology S2